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


7.
Aldehydes and ketones undergo which type of addition reactions?
A.
Free radical addition
B.
Electrophilic addition
C.
Cyclic addition
D.
Nucleophilic addition
😑 View Answer Rough Work Error
ANSWER :
D. Nucleophilic addition
8.
During nucleophilic addition to the carbonyl group, the hybridisation of carbon changes from:
A.
sp³ to sp²
B.
sp² to sp³
C.
sp² to sp
D.
sp to sp²
😑 View Answer Rough Work Error
ANSWER :
B. sp² to sp³
9.
In the nucleophilic addition mechanism, the nucleophile attacks the carbonyl carbon:
A.
From a direction parallel to C=O bond
B.
Approximately perpendicular to the plane of sp² orbitals
C.
In the same plane as sp² orbitals
D.
Along the axis of the C=O bond
😑 View Answer Rough Work Error
ANSWER :
B. Approximately perpendicular to the plane of sp² orbitals
10.
Aldehydes are generally more reactive than ketones in nucleophilic addition reactions because:
A.
Of both steric and electronic factors
B.
Aldehydes are more soluble in water
C.
Ketones have less polar C=O bond
D.
Aldehydes have higher boiling points
😑 View Answer Rough Work Error
ANSWER :
A. Of both steric and electronic factors
11.
Which of the following is most reactive towards nucleophilic addition?
A.
CH₃COCH₃
B.
CH₃CHO
C.
HCHO
D.
C₆H₅COCH₃
😑 View Answer Rough Work Error
ANSWER :
C. HCHO
12.
The correct order of reactivity towards HCN is:
A.
CH₃COCH₃ > HCHO > CH₃CHO > (CH₃)₃CCOCH₃
B.
CH₃CHO > HCHO > CH₃COCH₃ > (CH₃)₃CCOCH₃
C.
(CH₃)₃CCOCH₃ > CH₃COCH₃ > CH₃CHO > HCHO
D.
HCHO > CH₃CHO > CH₃COCH₃ > (CH₃)₃CCOCH₃
😑 View Answer Rough Work Error
ANSWER :
D. HCHO > CH₃CHO > CH₃COCH₃ > (CH₃)₃CCOCH₃