Class 12 Chemistry Ch-12 Aldehydes, Ketones and Carboxylic Acids MCQs Exam 2027

Chapter: Aldehydes, Ketones and Carboxylic Acids (150 MCQs)

Topic 1: Structure, Nomenclature and General Introduction

1. What is the hybridization of carbon in the carbonyl group ($>C=O$)? [BSEB, 2021 A]

(A) $sp$

(B) $sp^2$

(C) $sp^3$

(D) $sp^3d$

2. The IUPAC name of $CH_3COOH$ is: [BSEB, 2019 A]

(A) Methanoic acid

(B) Ethanoic acid

(C) Propanoic acid

(D) Methanol

3. The functional group of ketone is: [BSEB, 2020 A]

(A) $>C=O$

(B) $-CHO$

(C) $-COOH$

(D) $-OH$

4. The IUPAC name of $CH_3-CO-CH_3$ is: [BSEB, 2021 A]

(A) Propanone

(B) Propane

(C) Propanol

(D) Ethanone

5. The general formula of carbonyl compounds is: [BSEB, 2025 A]

(A) $C_nH_{2n}O$

(B) $C_nH_{2n+2}O$

(C) $C_nH_{2n-1}O$

(D) None of these

6. The IUPAC name of $CH_3-CH(OH)-COOH$ is: [BSEB, 2023 A]

(A) Lactic acid

(B) 2-hydroxy propanoic acid

(C) Propanoic acid

(D) None of these

7. The general formula of saturated monocarboxylic acids is: [BSEB, 2024 A]

(A) $C_nH_{2n+2}O$

(B) $C_nH_{2n}O$

(C) $C_nH_{2n}O_2$

(D) $C_nH_{2n+1}O_2$

8. The IUPAC name of $CH_3-CH(OH)-CH_2-CHO$ is: [BSEB, 2024 A]

(A) 2-hydroxybutanal

(B) 3-hydroxybutanal

(C) 2-hydroxypropanal

(D) None of these

9. The IUPAC name of $CH_3COOC_2H_5$ is: [BSEB, 2025 A]

(A) Methyl propionate

(B) Ethyl ethanoate

(C) Acetoyone

(D) Ethoxyethane

10. Between C and O in a carbonyl group, there is:

(A) One sigma ($\sigma$) bond

(B) One pi ($\pi$) bond

(C) One $\sigma$ and one $\pi$ bond

(D) Two $\sigma$ bonds

11. The IUPAC name of Formaldehyde (HCHO) is:

(A) Formaldehyde

(B) Methanal

(C) Ethanal

(D) Methanol

12. The IUPAC name of Acetaldehyde is:

(A) Ethanal

(B) Methanal

(C) Ethanol

(D) Ethene

13. The IUPAC name of Ethyl methyl ketone is:

(A) Butan-2-one

(B) Propanone

(C) Pentan-3-one

(D) Butan-1-one

14. Mesityl oxide is a/an:

(A) Aldehyde

(B) Ketone

(C) Carboxylic acid

(D) Ether

15. The functional group of Aldehyde is:

(A) $-CHO$

(B) $-OH$

(C) $-COOH$

(D) $-NH_2$

Topic 2: Preparation Methods

16. The reaction $R-CO-Cl + H_2 \xrightarrow{Pd/BaSO_4} RCHO + HCl$ is called: [BSEB, 2022 A]

(A) Cannizzaro’s reaction

(B) Rosenmund’s reaction

(C) Haloform reaction

(D) Clemmensen reduction

17. Dry distillation of calcium formate gives: [BSEB, 2021 A, 2023 A]

(A) $HCHO$

(B) $HCOOH$

(C) $CH_3CHO$

(D) $CH_3COOH$

18. On heating calcium acetate, which of the following is obtained? [BSEB, 2019 A]

(A) Ethyl acetate

(B) Formaldehyde

(C) Acetone

(D) Acetaldehyde

19. Dry distillation of calcium benzoate gives: [BSEB, 2020 A]

(A) Benzaldehyde

(B) Benzophenone

(C) Benzene

(D) Benzoic acid

20. Reaction of $CH_3MgBr$ with $CO_2$ gives: [BSEB, 2021 A]

(A) $CH_3COOH$

(B) $HCOOH$

(C) $CH_3CHO$

(D) $CH_3OH$

21. Which of the following forms acetaldehyde on heating with aqueous KOH? [BSEB, 2021 A]

(A) $CH_3CH_2Cl$

(B) $CH_2Cl.CH_2Cl$

(C) $CH_3CHCl_2$

(D) $CH_3COCl$

22. The reagent used to prepare ketone from acetyl chloride is:

(A) Grignard reagent

(B) $LiAlH_4$

(C) Dimethyl cadmium

(D) Benedict’s solution

23. The reaction that prepares benzaldehyde by oxidation of toluene is:

(A) Etard reaction

(B) Cannizzaro reaction

(C) Stephen reaction

(D) Rosenmund reaction

24. Ethyne on heating with water in the presence of $HgSO_4$ and $H_2SO_4$ gives:

(A) Ethanol

(B) Acetaldehyde

(C) Acetone

(D) Ethene

25. Stephen reduction of $CH_3CN$ followed by hydrolysis gives:

(A) $CH_3CHO$

(B) $CH_3CH_2NH_2$

(C) $CH_3COOH$

(D) $CH_4$

26. Reaction of Grignard reagent with ethyl formate gives:

(A) Aldehyde

(B) Ketone

(C) $3^\circ$ alcohol

(D) $2^\circ$ alcohol

27. Which of the following alcohols gives acetone upon oxidation?

(A) Acetic acid

(B) Isopropyl alcohol

(C) Propionic acid

(D) Formic acid

28. Ozonolysis of ethene gives:

(A) Two molecules of $HCHO$

(B) Two molecules of $CH_3CHO$

(C) $HCHO$ and $CH_3CHO$

(D) $CO_2$

29. Heating benzene with CO and HCl in the presence of $AlCl_3$ gives:

(A) Benzaldehyde

(B) Benzoic acid

(C) Chlorobenzene

(D) Toluene

30. Which of the following reactions is used to prepare aldehydes?

(A) Gattermann-Koch reaction

(B) Stephen reaction

(C) Rosenmund reaction

(D) All of the above

Topic 3: Chemical Properties (Aldol, Cannizzaro and others)

31. Aldehydes which do not have $\alpha$-hydrogen take part in: [BSEB, 2019 A]

(A) Cannizzaro’s reaction

(B) Aldol condensation

(C) Perkin’s reaction

(D) None of these

32. Which of the following gives Cannizzaro’s reaction? [BSEB, 2023 A]

(A) $CH_3CHO$

(B) $HCHO$

(C) $CH_3COCH_3$

(D) $CH_3CH_2CHO$

33. Which of the following takes part in Aldol condensation? [BSEB, 2020 A]

(A) $CH_3CHO$

(B) $HCHO$

(C) $C_6H_5CHO$

(D) $(CH_3)_3C-CHO$

34. On heating formaldehyde with NaOH solution, we get: [BSEB, 2021 A]

(A) Formic acid

(B) Acetone

(C) Methyl alcohol

(D) Ethyl formate

35. Benzaldehyde on heating with NaOH gives:

(A) Benzyl alcohol

(B) Benzoic acid

(C) Sodium benzoate

(D) Both (A) and (C)

36. In Aldol condensation, the reagent used is: [BSEB, 2018 A]

(A) Dilute base

(B) Concentrated base

(C) Acidic medium

(D) None of these

37. Which of the following does not show Cannizzaro’s reaction? [BSEB, 2018 A]

(A) Formaldehyde

(B) Acetaldehyde

(C) Benzaldehyde

(D) Trimethyl acetaldehyde

38. Heating acetone with concentrated $H_2SO_4$ gives:

(A) Mesitylene

(B) Mesityl oxide

(C) Phorone

(D) Benzene

39. Reaction of aldehyde with $NH_2OH$ gives: [BSEB, 2024 A]

(A) Oxime

(B) Hydrazone

(C) Schiff’s base

(D) Amine

40. On heating formaldehyde with ammonia, which is formed? [BSEB, 2024 A]

(A) Urotropine

(B) Methyl amine

(C) Acetamide

(D) Formamide

41. The reagent used in Clemmensen reduction is:

(A) $Zn-Hg/HCl$

(B) $NH_2NH_2/KOH$

(C) $LiAlH_4$

(D) $NaBH_4$

42. Wolff-Kishner reduction converts the carbonyl group into:

(A) $-CH_3$

(B) $-CH_2-$

(C) $-OH$

(D) $-NH_2$

43. Chloretone is formed when chloroform reacts with: [BSEB, 2024 A]

(A) Acetone

(B) Formaldehyde

(C) Acetaldehyde

(D) Benzaldehyde

44. Heating acetone with bleaching powder gives: [BSEB, 2024 A]

(A) Chloroform

(B) Iodoform

(C) Chlorine

(D) Ethane

45. The reaction of aldehydes and ketones with $HCN$ is:

(A) Nucleophilic addition

(B) Electrophilic addition

(C) Free radical addition

(D) Substitution reaction

46. Schiff’s base is obtained from:

(A) Aldehyde + Primary amine

(B) Aldehyde + Ammonia

(C) Ketone + Alcohol

(D) None of these

47. Reduction of carbonyl compounds by $NaBH_4$ gives:

(A) Alcohol

(B) Alkane

(C) Amine

(D) Acid

48. Paraldehyde is a trimer of: [BSEB, 2016 C]

(A) Ethanal

(B) Methanal

(C) Propanal

(D) Butanal

49. Metaformaldehyde is a polymer of:

(A) $HCHO$

(B) $CH_3CHO$

(C) $CH_3COCH_3$

(D) $CH_3COOH$

50. The chemical name of Urotropine is:

(A) Hexamethylene tetramine

(B) Tetramethylene hexamine

(C) Dimethyl amine

(D) None of these

Topic 4: Detection and Chemical Tests

51. The reagent used to distinguish between aldehydes and ketones is: [BSEB, 2018 A]

(A) Fehling’s solution

(B) Grignard reagent

(C) $NH_2OH$

(D) $HCN$

52. Which aldehyde does not reduce Fehling’s solution? [BSEB, 2018 A]

(A) Benzaldehyde

(B) Acetaldehyde

(C) Formaldehyde

(D) Propanal

53. Which of the following compounds gives Iodoform test? [BSEB, 2022 A]

(A) $CH_3CHO$

(B) $CH_3CH_2OH$

(C) $CH_3COCH_3$

(D) All of these

54. Schiff’s reagent gives color with aldehydes: [BSEB, 2023 A]

(A) Pink

(B) Blue

(C) Yellow

(D) Green

55. Tollen’s reagent is: [BSEB, 2023 A]

(A) Ammoniacal silver nitrate

(B) Alkaline copper sulfate

(C) Acidic $KMnO_4$

(D) None of these

56. Silver mirror test is given by:

(A) Aldehydes

(B) Ketones

(C) Ethers

(D) Alkanes

57. The group required for Iodoform test is:

(A) $CH_3CO-$

(B) $CH_3CH(OH)-$

(C) Both (A) and (B)

(D) None of these

58. Fehling’s solution ‘A’ is:

(A) Aqueous $CuSO_4$ solution

(B) Rochelle salt

(C) $NaOH$ solution

(D) $AgNO_3$ solution

59. Fehling’s solution ‘B’ contains:

(A) Sodium potassium tartrate

(B) Copper sulfate

(C) Sodium carbonate

(D) None of these

60. The formation of a silver mirror in Tollen’s test indicates:

(A) Oxidation of aldehyde

(B) Reduction of aldehyde

(C) Oxidation of ketone

(D) None of these

61. Which of the following will not give Iodoform test?

(A) $CH_3OH$

(B) $C_2H_5OH$

(C) $CH_3CHO$

(D) $CH_3COCH_3$

62. Benedict’s solution is used for the detection of:

(A) Aldehydes

(B) Ketones

(C) Alcohols

(D) Esters

63. To distinguish between $HCHO$ and $CH_3CHO$, we use:

(A) Iodoform test

(B) Tollen’s test

(C) Fehling’s test

(D) Litmus test

64. Ketones reduce Tollen’s reagent:

(A) Do not reduce

(B) Do reduce

(C) Reduce under special conditions

(D) None of these

65. Chloral ($CCl_3CHO$) with Fehling’s solution:

(A) Gives red precipitate

(B) Does not react

(C) Gives blue color

(D) None of these

Topic 5: Carboxylic Acids (Introduction and Preparation)

66. Which acid is found in Vinegar? [BSEB, 2020 A]

(A) $HCOOH$

(B) $CH_3COOH$

(C) $C_2H_5COOH$

(D) None of these

67. Hydrolysis of $CH_3CN$ in presence of $H_3O^+$ gives: [BSEB, 2021 A]

(A) $CH_3COOH$

(B) $CH_3CH_2NH_2$

(C) $CH_3CONH_2$

(D) $CH_3CHO$

68. $HCOOH$ is a: [BSEB, 2019 A]

(A) Monobasic acid

(B) Dibasic acid

(C) Tribasic acid

(D) Mineral acid

69. The functional group of carboxylic acid is: [BSEB, 2020 A]

(A) $-OH$

(B) $-CHO$

(C) $-COOH$

(D) $-CO-$

70. $C_nH_{2n}O_2$ is the general formula for: [BSEB, 2022 A]

(A) Carboxylic acid

(B) Ester

(C) Both (A) and (B)

(D) Aldehyde

71. Palmitic acid is an example of: [BSEB, 2022 A]

(A) Fatty acid

(B) Mineral acid

(C) Amino acid

(D) None of these

72. Heating formic acid with conc. $H_2SO_4$ gives: [BSEB, 2023 A]

(A) $CO$

(B) $CO_2$

(C) $SO_2$

(D) $CH_4$

73. Heating acetic acid with $P_2O_5$ gives: [BSEB, 2023 A]

(A) $(CH_3CO)_2O$

(B) $CH_3CHO$

(C) $CH_4$

(D) $CO_2$

74. The amount of acetic acid in Vinegar is: [BSEB, 2025 A]

(A) 6-10%

(B) 50%

(C) 100%

(D) 1%

75. Pyroligneous acid contains: [BSEB, 2022 A]

(A) 10% acetic acid

(B) 2% methyl alcohol

(C) 0.5% acetone

(D) All of the above

76. Hydrolysis of the product obtained from reaction of Grignard reagent with $CO_2$ gives:

(A) Carboxylic acid

(B) Aldehyde

(C) Ketone

(D) Alcohol

77. Acidic hydrolysis of an ester gives:

(A) Acid + Alcohol

(B) Acid + Aldehyde

(C) Ketone + Alcohol

(D) Only acid

78. Oxidation of alkyl benzene ($C_6H_5R$) by $KMnO_4$ gives:

(A) Benzoic acid

(B) Phenol

(C) Benzaldehyde

(D) Benzene

79. The IUPAC name of Formic acid is:

(A) Methanoic acid

(B) Ethanoic acid

(C) Propanoic acid

(D) Formic acid

80. The IUPAC name of $CH_3CH_2COOH$ is:

(A) Propanoic acid

(B) Ethanoic acid

(C) Butanoic acid

(D) Propanal

Topic 6: Chemical Properties and Acidic Strength

81. Which of the following is most acidic?

(A) $Cl_3CCOOH$

(B) $Cl_2CHCOOH$

(C) $ClCH_2COOH$

(D) $CH_3COOH$

82. Formic acid changes blue litmus to: [BSEB, 2025 A]

(A) Red

(B) Green

(C) Yellow

(D) No change

83. Reaction of $CH_3COOH$ with $LiAlH_4$ gives: [BSEB, 2023 A]

(A) Ethyl alcohol

(B) Methyl alcohol

(C) Acetaldehyde

(D) Acetone

84. An organic compound gives effervescence with $NaHCO_3$. It is: [BSEB, 2026 A]

(A) Carboxylic acid

(B) Alcohol

(C) Alkane

(D) Ester

85. HVZ reaction is given by:

(A) Carboxylic acids with $\alpha$-H

(B) Formic acid

(C) Benzoic acid

(D) Acetone

86. Reaction of carboxylic acid with $PCl_5$ gives:

(A) Acid chloride

(B) Alkyl chloride

(C) Aldehyde

(D) Ester

87. Formic acid and acetic acid can be distinguished by:

(A) Tollen’s reagent

(B) Fehling’s solution

(C) $HgCl_2$ solution

(D) All of the above

88. Reaction of acetic acid with $Cl_2$ in the presence of red phosphorus gives:

(A) Monochloroacetic acid

(B) Acetyl chloride

(C) Ethyl chloride

(D) Chloroform

89. Carboxylic acids form ______ due to hydrogen bonding:

(A) Dimers

(B) Trimers

(C) Polymers

(D) None of these

90. Nitration of benzoic acid gives the major product:

(A) m-nitrobenzoic acid

(B) o-nitrobenzoic acid

(C) p-nitrobenzoic acid

(D) 2,4-dinitrobenzoic acid

91. Reduction of carboxylic acid by $HI/P$ gives:

(A) Alkane

(B) Alcohol

(C) Aldehyde

(D) Ketone

92. On heating oxalic acid, we get:

(A) $CO + CO_2 + H_2O$

(B) $CO_2$

(C) Formic acid

(D) Both (A) and (C)

93. Heating carboxylic acid with soda lime ($NaOH + CaO$) leads to:

(A) Decarboxylation

(B) Oxidation

(C) Reduction

(D) Halogenation

94. Heating sodium acetate with soda lime gives:

(A) Methane

(B) Ethane

(C) Acetic acid

(D) Acetone

95. Sodium salts of fatty acids are called:

(A) Soaps

(B) Detergents

(C) Esters

(D) Ethers

Topic 7: Acid Derivatives

96. The functional group of ester is: [BSEB, 2022 A]

(A) $-COOR$

(B) $-CHO$

(C) $-COOH$

(D) $-CONH_2$

97. The name of $CH_3CONH_2$ is: [BSEB, 2019 A]

(A) Acetamide

(B) Ethyl amine

(C) Formamide

(D) Methyl amide

98. The functional group of amide is: [BSEB, 2020 A]

(A) $-CONH_2$

(B) $-NH_2$

(C) $-CHO$

(D) $-COOH$

99. The IUPAC name of $CH_3COCl$ is:

(A) Ethanoyl chloride

(B) Acetyl chloride

(C) Methanoyl chloride

(D) Propanoyl chloride

100. Hydrolysis of an ester is called:

(A) Saponification

(B) Esterification

(C) Hydrogenation

(D) None of these

101. Reduction of an amide by $LiAlH_4$ gives:

(A) Amine

(B) Alcohol

(C) Alkane

(D) Aldehyde

102. Reaction of acetyl chloride with ethyl alcohol gives:

(A) Ethyl acetate

(B) Acetic acid

(C) Diethyl ether

(D) Acetone

103. Heating ammonium acetate gives:

(A) Acetamide

(B) Acetic acid

(C) Ammonia

(D) Methane

104. The formula of Ethyl acetate is:

(A) $CH_3COOC_2H_5$

(B) $C_2H_5COOCH_3$

(C) $CH_3COOCH_3$

(D) $HCOOC_2H_5$

105. Esters have a ______ smell:

(A) Fruity

(B) Rotten fish

(C) Pungent

(D) Odorless

Topic 8: Additional Important Questions (106 – 150)

106. Which of the following is most reactive towards nucleophilic addition? [BSEB, 2018 A]

(A) $HCHO$

(B) $CH_3CHO$

(C) $CH_3COCH_3$

(D) $C_6H_5CHO$

107. $CH_3-CO-CH_3$ and $CH_3CH_2CHO$ are:

(A) Functional isomers

(B) Position isomers

(C) Chain isomers

(D) None of these

108. The main component of Vinegar is: [BSEB, 2019 A]

(A) Acetic acid

(B) Formic acid

(C) Propionic acid

(D) Butanoic acid

109. $C_nH_{2n}O$ is the general formula for:

(A) Aldehyde

(B) Ketone

(C) Both (A) and (B)

(D) Ether

110. The main product of reaction of $HCOOH$ with $PCl_5$ is:

(A) $CO + HCl$

(B) $HCOCl$

(C) $COCl_2$

(D) None of these

111. The reagent used to distinguish between aldehydes and ketones is: [BSEB, 2018 A]

(A) Fehling’s solution

(B) Grignard reagent

(C) $NH_2OH$

(D) $HCN$

112. $C_nH_{2n}O_2$ is the general formula for: [BSEB, 2022 A]

(A) Carboxylic acid

(B) Ester

(C) Both (A) and (B)

(D) Aldehyde

113. Fehling test is used to detect: [BSEB, 2025 A]

(A) Aldehyde

(B) Amine

(C) Ether

(D) Alcohol

114. The product of $C_6H_5COCl + H_2 \xrightarrow{Pd/BaSO_4} ?$ is: [BSEB, 2021 A]

(A) Benzaldehyde

(B) Benzene

(C) Benzyl alcohol

(D) Benzoic acid

115. The functional group of carboxylic acid is: [BSEB, 2020 A]

(A) $-OH$

(B) $-CHO$

(C) $-COOH$

(D) $-CO-$

116. Heating acetone with chloroform in the presence of KOH gives:

(A) Chloretone

(B) Chloropicrin

(C) Mesitylene

(D) Phosgene

117. Heating acetic acid with ethyl alcohol in the presence of conc. $H_2SO_4$ gives:

(A) Ethyl acetate

(B) Acetamide

(C) Ethyl chloride

(D) Ether

118. Between formic acid and acetic acid, which is stronger?

(A) Formic acid

(B) Acetic acid

(C) Both are equal

(D) None of these

119. Chloral hydrate is stable because of:

(A) Intra-molecular hydrogen bonding

(B) Size of chlorine

(C) High molecular weight

(D) None of these

120. Reduction of acetone with $Mg-Hg/H_2O$ gives:

(A) Pinacol

(B) Propanol

(C) Propane

(D) Acetamide

121. Which of the following is the strongest acid?

(A) $F-CH_2COOH$

(B) $Cl-CH_2COOH$

(C) $Br-CH_2COOH$

(D) $I-CH_2COOH$

122. The product formed in Aldol condensation is:

(A) $\beta$-hydroxy aldehyde

(B) $\alpha$-hydroxy aldehyde

(C) Unsaturated acid

(D) Ketone

123. The role of $BaSO_4$ in Rosenmund reduction is:

(A) Catalytic poison

(B) Promoter

(C) Solvent

(D) Reducing agent

124. The common group in both aldehyde and ketone is:

(A) Carbonyl

(B) Hydroxyl

(C) Carboxyl

(D) Ester

125. The group(s) found in formic acid is/are:

(A) $-CHO$

(B) $-COOH$

(C) Both (A) and (B)

(D) None of these

126. Heating the solid obtained from reaction of $CH_3COOH$ with $NH_3$ gives:

(A) Acetamide

(B) Methyl amine

(C) Ammonium acetate

(D) Ethane

127. Heating $HCOOH$ gives:

(A) $CO + H_2O$

(B) $CO_2 + H_2$

(C) $CH_2O$

(D) None of these

128. The formula of Urotropine is:

(A) $(CH_2)_6N_4$

(B) $(CH_2)_4N_6$

(C) $(CH_2)_6N_2$

(D) $(CH_2)_2N_4$

129. Benzoic acid with aqueous NaOH forms:

(A) Sodium benzoate

(B) Benzene

(C) Phenol

(D) Benzaldehyde

130. Acetophenone is a:

(A) Ethyl methyl ketone

(B) Methyl phenyl ketone

(C) Diphenyl ketone

(D) None of these

131. Oxidation of ketone under vigorous conditions gives:

(A) Carboxylic acid (with fewer carbons)

(B) Aldehyde

(C) Alcohol

(D) Ether

132. Which of the following compounds will not give haloform reaction?

(A) $CH_3CHO$

(B) $CH_3CH_2CHO$

(C) $CH_3COCH_3$

(D) $CH_3CH(OH)CH_3$

133. Reaction of acetone with $PCl_5$ gives:

(A) 2,2-dichloropropane

(B) 1,1-dichloropropane

(C) Acetyl chloride

(D) Isopropyl chloride

134. Oxidation of an aldehyde gives:

(A) Carboxylic acid

(B) Ketone

(C) Ester

(D) Ether

135. At room temperature, formaldehyde is: [BSEB, 2025 A]

(A) Gas

(B) Liquid

(C) Solid

(D) None of these

136. Formalin is a commercial name for: [BSEB, 2024 A]

(A) 40% aqueous solution of methanal

(B) Formic acid

(C) Acetic acid

(D) Acetone

137. Oxidation of $CH_3CHO$ with $K_2Cr_2O_7/H_2SO_4$ gives: [BSEB, 2024 A]

(A) $CH_3COOH$

(B) $CH_3OH$

(C) $HCOOH$

(D) $CO_2$

138. Which of the following is Chloral? [BSEB, 2025 A]

(A) $CCl_3.CHO$

(B) $CCl_3.COCH_3$

(C) $CCl_3.COCl_3$

(D) $CCl_3.CH_2OH$

139. Reaction of acetaldehyde with $NH_2NH_2$ gives:

(A) Acetaldehyde hydrazone

(B) Acetamide

(C) Aceto-oxime

(D) Ethyl amine

140. The color of precipitate formed when aldehyde reacts with Fehling’s solution is:

(A) Red

(B) Blue

(C) Yellow

(D) Black

141. Carboxylic acids release ______ with $NaHCO_3$:

(A) $CO_2$

(B) $H_2$

(C) $O_2$

(D) $CO$

142. The effect of a carboxylic group directly attached to a benzene ring is:

(A) -M effect (Meta directing)

(B) +M effect (Ortho-para directing)

(C) No effect

(D) None of these

143. Reaction of Grignard reagent with $CH_3CHO$ followed by hydrolysis gives:

(A) $2^\circ$ alcohol

(B) $1^\circ$ alcohol

(C) $3^\circ$ alcohol

(D) Ketone

144. The formula of Propionic acid is:

(A) $CH_3CH_2COOH$

(B) $CH_3COOH$

(C) $HCOOH$

(D) $CH_3CH_2CH_2COOH$

145. Melting and boiling points of esters compared to carboxylic acids are:

(A) Lower

(B) Higher

(C) Equal

(D) None of these

146. Heating benzaldehyde with Na in dry ether gives:

(A) Hydrobenzoin

(B) Benzyl alcohol

(C) Benzoic acid

(D) Benzene

147. Which of the following acids is optically active?

(A) Lactic acid

(B) Acetic acid

(C) Formic acid

(D) Oxalic acid

148. The most suitable catalyst for reducing acid chloride to aldehyde is:

(A) $Pd-BaSO_4$

(B) $Ni$

(C) $Pt$

(D) $LiAlH_4$

149. Which reagent reacts with both aldehydes and ketones?

(A) $NH_2NH_2$

(B) $HCN$

(C) $NaHSO_3$

(D) All of the above

150. Reaction of $CH_3-CO-CH_3$ with $Zn-Hg/HCl$ gives:

(A) Propane

(B) Propanol

(C) Propyne

(D) Ethane