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1

AIPMT 2000

MCQ (Single Correct Answer)
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.
2

AIPMT 2000

MCQ (Single Correct Answer)
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

AIPMT 2000

MCQ (Single Correct Answer)
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 :
4

AIPMT 2000

MCQ (Single Correct Answer)
In Friedel-Crafts reaction , toluene can be prepared by
A
C6H6 + CH3Cl
B
C6H5Cl + CH4
C
C6H6 + CH2Cl2
D
C6H6 + CH3COCl

Explanation

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