1
MCQ (Single Correct Answer)

AIPMT 2009

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
MCQ (Single Correct Answer)

AIPMT 2009

Trichloroacetaldehyde, CCl3CHO reacts with chlorobenzene in presence of sulphuric acid and produces
A
B
C
D

Explanation

3
MCQ (Single Correct Answer)

AIPMT 2008

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
MCQ (Single Correct Answer)

AIPMT 2008

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.

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