Due to restricted rotation about double bond, 2-butene shows geometrical isomerism.
2
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.
3
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 :
4
MCQ (Single Correct Answer)
AIPMT 2000
In Friedel-Crafts reaction , toluene can be prepared by
A
C6H6 + CH3Cl
B
C6H5Cl + CH4
C
C6H6 + CH2Cl2
D
C6H6 + CH3COCl
Explanation
Questions Asked from Hydrocarbons
On those following papers in MCQ (Single Correct Answer) Number in Brackets after Paper Name Indicates No of Questions
