1
MCQ (Single Correct Answer)

AIPMT 2015 Cancelled Paper

An organic compound 'X' having molecular formula C5H10O yields phenylhydrazone and gives negative response to the iodoform test and Tollens' test. It produces n-pentane on reduction. 'X' could be
A
3-pentanone
B
n-amyl alcohol
C
pentanal
D
2-pentanone

Explanation

As the compound X yields phenyl hydrazone and gives negative response to the iodoform test and Tollen’s test so it must contain a C = O group but neither a methyl ketone nor in aldehyde. Thus, the structure of X will be

2
MCQ (Single Correct Answer)

AIPMT 2015

Reaction of a carbonyl compound with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is
A
hydrazine in presence of feebly acidic solution
B
hydrocyanic acid
C
sodium hydrogen sulphate
D
a Grignard reagent.

Explanation

Carbonyl compounds react with ammonia derivatives in weakly acidic medium as follows :
3
MCQ (Single Correct Answer)

AIPMT 2015

The oxidation of benzene by V2O5 in the presence of air produces
A
maleic anhydride
B
benzoic acid
C
benzaldehyde
D
benzoic anhydride.

Explanation

4
MCQ (Single Correct Answer)

AIPMT 2014

Which one is most reactive towards nucleophilic addition reaction?
A
B
C
D

Explanation

Electron withdrawing (–I, –M) groups are more reactive towards nucleophilic addition reactions. Thus, correct order is :

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