Aldehyde and Ketones (Nature of Carbonyl Group, Nucleophilic Addition to >C=O group,...) NEET Questions

Organic Chemistry - Organic Compounds Containing Oxygen

Aldehyde and Ketones (Nature of Carbonyl Group, Nucleophilic Addition to >C=O group,...) MCQ Questions


13.
Benzaldehyde is less reactive than aliphatic aldehydes towards nucleophilic addition because:
A.
Of higher boiling point
B.
Of resonance with benzene ring reducing carbonyl polarity
C.
Of higher molecular weight
D.
Of presence of -OH group
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ANSWER :
B. Of resonance with benzene ring reducing carbonyl polarity
14.
Arrange in decreasing order of reactivity towards nucleophilic addition: Benzaldehyde, p-Nitrobenzaldehyde, p-Methoxybenzaldehyde, p-Tolualdehyde
A.
Benzaldehyde > p-Nitrobenzaldehyde > p-Tolualdehyde > p-Methoxybenzaldehyde
B.
p-Tolualdehyde > Benzaldehyde > p-Nitrobenzaldehyde > p-Methoxybenzaldehyde
C.
p-Nitrobenzaldehyde > Benzaldehyde > p-Tolualdehyde > p-Methoxybenzaldehyde
D.
p-Methoxybenzaldehyde > p-Tolualdehyde > Benzaldehyde > p-Nitrobenzaldehyde
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ANSWER :
C. p-Nitrobenzaldehyde > Benzaldehyde > p-Tolualdehyde > p-Methoxybenzaldehyde
15.
Aldehydes and ketones react with HCN to give:
A.
Isocyanides
B.
Cyanides
C.
Carbamates
D.
Cyanohydrins
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ANSWER :
D. Cyanohydrins
16.
The reaction of aldehydes with HCN is catalysed by:
A.
Base
B.
Heat alone
C.
Light
D.
Strong acid
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ANSWER :
A. Base
17.
The actual nucleophile in HCN addition to carbonyl compound is:
A.
HCN
B.
OH⁻
C.
CN⁻
D.
H⁺
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ANSWER :
C. CN⁻
18.
The product of the reaction of acetone with HCN is:
A.
Acetone cyanide
B.
2-Hydroxy-2-methylpropanenitrile
C.
Acetonitrile
D.
Methyl isocyanide
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ANSWER :
B. 2-Hydroxy-2-methylpropanenitrile