1
MCQ (Single Correct Answer)

AIPMT 2001

The correct acidic order of the following is

A
I > II > III
B
III > I > II
C
II > III > I
D
I > III > II

Explanation

Presence of electron withdrawing groups (– NO2, –X, – CN) increase the acidity of phenols while the presence of electron releasing groups (– NH2, – CH3) decrease the acidity of phenols. This explains the following order of acidity.

p-nitrophenol > phenol > p-cresol.
2
MCQ (Single Correct Answer)

AIPMT 2001

In preparation of alkene from alcohol using Al2O3 which is the effective factor ?
A
Porosity of Al2O3
B
Temperature
C
Concentration
D
Surface area of Al2O3

Explanation

3
MCQ (Single Correct Answer)

AIPMT 2000

2-Butene shows geometrical isomerism due to
A
restricted rotation about double bond
B
free rotation about double bond
C
free rotation about single bond
D
chiral carbon

Explanation

Due to restricted rotation about double bond, 2-butene shows geometrical isomerism.
4
MCQ (Single Correct Answer)

AIPMT 2000

Dihedral angle in staggered form of ethane is
A
0o
B
12o
C
60o
D
180o

Explanation

The staggered form of ethane has the following structure and the dihedral angle is 60o, which means ‘H’ atoms are at an angle of 60o to each other.

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