NEW
New Website Launch
Experience the best way to solve previous year questions with mock tests (very detailed analysis), bookmark your favourite questions, practice etc...
1

AIPMT 2009

MCQ (Single Correct Answer)
Propionic acid with Br2/P yields a dibromo product. Its structure would be
A
B
CH2(Br) $$-$$ CH2 $$-$$ COBr
C
D
CH2(Br) $$-$$ CH(Br) $$-$$ COOH

Explanation

This is Hell–Volhard–Zelinsky reaction.
In this reaction, acids containing $$\alpha $$-H react with Br2 /red P giving product in which the $$\alpha $$-hydrogens are substituted by Br.
2

AIPMT 2009

MCQ (Single Correct Answer)
Trichloroacetaldehyde, CCl3CHO reacts with chlorobenzene in presence of sulphuric acid and produces
A
B
C
D

Explanation

3

AIPMT 2008

MCQ (Single Correct Answer)
Acetophenone when reacted with a base, C2H5ONa,   yields a stable compound which has the structure
A
B
C
D

Explanation

This reaction is known as aldol condensation.

C2H5ONa $$ \Rightarrow $$ C2H5O- + Na+

4

AIPMT 2008

MCQ (Single Correct Answer)
The relative reactivities of acyl compounds towards nucleophilic substitution are in the order of
A
Acid anhydride > Amide > Ester > Acyl chloride
B
Acyl chloride > Ester > Acid anhydride > Amide
C
Acyl chloride > Acid anhydride > Ester > Amide
D
Ester > Acyl chloride > Amide > Acid anhydride.

Explanation

The more the basic character of the leaving group, the lesser is the reactivity the basic character follows the order

NH2 > OR > RCOO > Cl

Hence, the relative reactivities of acyl compounds towards nucleophilic substitution follow the order

Acyl halides > Acid anhydride > Ester > Amide.

Joint Entrance Examination

JEE Main JEE Advanced WB JEE

Graduate Aptitude Test in Engineering

GATE CSE GATE ECE GATE EE GATE ME GATE CE GATE PI GATE IN

Medical

NEET

CBSE

Class 12