1
MCQ (Single Correct Answer)

AIPMT 2012 Prelims

Predict the products in the given reaction.

A
B
C
D

Explanation

2
MCQ (Single Correct Answer)

AIPMT 2012 Mains

Consider the reaction :
RCHO + NH2NH2 $$ \to $$ RCH $$=$$ N $$-$$ NH2

What sort of reaction is it?
A
Electrophilic addition-elimination reaction
B
Free radical addition-elimination reaction
C
Electrophilic substitution-elimination reaction
D
Nucleophilic addition-elimination reaction

Explanation

RCHO + NH2NH2 $$ \to $$ RCH $$=$$ N $$-$$ NH2

Such reactions take place in slightly acidic medium and involve nucleophilic addition of the ammonia derivative.
3
MCQ (Single Correct Answer)

AIPMT 2012 Prelims

CH3CHO and C6H5CH2CHO can be distinguished chemically by
A
Benedict's test
B
Iodoform test
C
Tollen's reagent test
D
Fehling's solution test

Explanation

CH3CHO gives Iodoform test but C6H5CH2CHO does not give Iodoform test due to absence of methyl group.
4
MCQ (Single Correct Answer)

AIPMT 2012 Prelims

The correct order of decreasing acid strength of trichloroacetic acid (A), trifluoroacetic acid (B), acetic acid (C) and formic acid (D) is
A
B > A > D > C
B
B > D > C > A
C
A > B > C > D
D
A > C > B > D

Explanation

As –I effect increases, COOH group becomes more electron deficient and tendency to loose H+ ions increases i.e., acid strength increases. As +I effect increases, acid strength decreases. Thus, correct order of acid strength is

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