1
MCQ (Single Correct Answer)

AIPMT 2008

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.
2
MCQ (Single Correct Answer)

AIPMT 2007

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

3
MCQ (Single Correct Answer)

AIPMT 2007

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
4
MCQ (Single Correct Answer)

AIPMT 2007

Consider the following compounds

The correct decreasing order of their reactivity towards hydrolysis is
A
(i) > (ii) > (iii) > (iv)
B
(iv) > (ii) > (i) > (iii)
C
(ii) > (iv) > (i) > (iii)
D
(ii) > (iv) > (iii) > (i)

Explanation

The ease of hydrolysis depends upon the magnitude of the +ve charge on the carbonyl group. Electron-withdrawing groups increase the magnitude of positive charge and electron donating groups decrease the magnitude of positive charge. Hence, the decreasing order of reactivity towards hydrolysis is

(ii) > (iv) > (i) > (iii)

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