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1

AIPMT 2010 Prelims

MCQ (Single Correct Answer)
Given are cyclohexanol (I), acetic acid (II), 2, 4, 6-trinitrophenol (III) and phenol (IV). In these the order of decreasing acidic character will be
A
III > II > IV > I
B
II > III > I > IV
C
II > III > IV > I
D
III > IV > II > I

Explanation

As we know that phenols and carboxylic acids are more acidic than aliphatic alcohols thus cyclohexanol is least acidic.

On the other hand III is more acidic than IV because of the presence of three highly electron with drawing NO2 groups on the benzene ring which makes the OH bond extremely polarized. This facilitates the release of H+.

In acetic acid the electron withdrawing $$ - \mathop C\limits_| = O$$

group polarizes the O-H bond and increases the acid strength.

Thus, acetic acid is more acidic than phenol or cyclohexanol.

Thus, the order of acidic strength will be

III > II > IV > I
2

AIPMT 2009

MCQ (Single Correct Answer)
Consider the following reaction :


the product Z is
A
CH3CH2 $$-$$ O $$-$$ CH2 $$-$$ CH3
B
CH3 $$-$$ CH2 $$-$$ O $$-$$ SO3H
C
CH3CH2OH
D
CH2$$=$$CH2

Explanation

3

AIPMT 2009

MCQ (Single Correct Answer)
HOCH2CH2OH on heating with periodic acid gives
A
2HCOOH
B
C
D
2CO2

Explanation

4

AIPMT 2009

MCQ (Single Correct Answer)
Consider the following reaction :


the product Z is
A
benzaldehyde
B
benzoic acid
C
benzene
D
toluene

Explanation

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