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1

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.
2

AIPMT 2008

MCQ (Single Correct Answer)
A strong base can abstract an $$\alpha $$-hydrogen from
A
ketone
B
alkane
C
alkene
D
amine

Explanation

As the carbonyl carbon is electron deficient so most susceptible to attack by ncleophilic reagent or base.

Thus $$\alpha $$-hydrogen is the easily obstructed from ketones by a base.
3

AIPMT 2007

MCQ (Single Correct Answer)
Which one of the following on treatment with 50% aqueous sodium hydroxide yields the corresponding alcohol and acid?
A
C6H5CHO
B
CH3CH2CH2CHO
C
D
C6H5CH2CHO

Explanation

4

AIPMT 2007

MCQ (Single Correct Answer)
Which of the following represents the correct order of the acidity in the given compounds ?
A
FCH2COOH > CH3COOH > BrCH2COOH > ClCH2COOH
B
BrCH2COOH > ClCH2COOH > FCH2COOH > CH3COOH
C
FCH2COOH > ClCH2COOH > BrCH2COOH > CH3COOH
D
CH3COOH > BrCH2COOH > ClCH2COOH > FCH2COOH

Explanation

Acidity decreases as the –I effect of the group decreases, F is the most electronegative atom and hence it has highest –I effect among the halogens.

FCH2COOH > ClCH2COOH > BrCH2COOH > CH3COOH

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