1
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Etard reaction is a method of preparation of benzaldehyde by oxidation of toluene. The oxidizing agent used in this reaction is:

A

Chromic oxide

B

Chromyl chloride

C

Potassium dichromate

D

Pyridinium chlorochromate

2
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Propanal on reaction with dilute NaOH , undergoes aldol condensation resulting in the formation of a compound A . identify the correct structure of A and name of the compound.

A

COMEDK 2026 Morning Shift Chemistry - Aldehyde and Ketone Question 7 English Option 1

B

COMEDK 2026 Morning Shift Chemistry - Aldehyde and Ketone Question 7 English Option 2

C

COMEDK 2026 Morning Shift Chemistry - Aldehyde and Ketone Question 7 English Option 3

D

COMEDK 2026 Morning Shift Chemistry - Aldehyde and Ketone Question 7 English Option 4

3
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

$$ \text { Identify the compounds } \mathrm{A} \text { and } \mathrm{B} \text { from the following reaction sequence: } $$

COMEDK 2026 Morning Shift Chemistry - Aldehyde and Ketone Question 8 English

A

COMEDK 2026 Morning Shift Chemistry - Aldehyde and Ketone Question 8 English Option 1

B

COMEDK 2026 Morning Shift Chemistry - Aldehyde and Ketone Question 8 English Option 2

C

COMEDK 2026 Morning Shift Chemistry - Aldehyde and Ketone Question 8 English Option 3

D

COMEDK 2026 Morning Shift Chemistry - Aldehyde and Ketone Question 8 English Option 4

4
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Which of the following is NOT TRUE about nucleophilic addition reactions of aldehydes?

A

2,4 DNP derivatives are useful to identify aldehydes and ketones

B

Hemiacetals are gem-dialkoxy compounds

C

The hydrogensulphite addition product is useful for separation and purification of aldehydes

D

Aldehydes and ketones react very slowly with pure HCN to yield cyanohydrins

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