1
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

2
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.
3
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.
4
MCQ (Single Correct Answer)

AIPMT 2000

Increasing order of electrophilic substitution for following compounds
A
IV < I < II < III
B
III < II < I < IV
C
I < IV < III < II
D
II < III < I < IV

Explanation

Among —CH3, —OCH3 and CF3,

CH3 and —OCH3 are electron donating groups. Hence, they activate the benzene ring. In these the order of activation is —OCH3 $$>$$ —CH3 while —CF3 group deactivates the benzene nucleus. So, it shows lower rate of electrophilic substitution on benzene ring. Thus, order of electrophilic substitution is :

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