Which of the following can be used as the halide component for Friedel-Crafts reaction?
A
Chlorobenzene
B
Bromobenzene
C
Chloroethane
D
Isopropyl chloride
Explanation
Friedel–Crafts reaction :
Chlorobenzene, bromobenzene and chloroethene
are not suitable halide components as lone pair of
electrons of halogen are delocalized with $$\pi $$-bonds
to attain double bond (C = X) character.
2
MCQ (Single Correct Answer)
NEET 2016 Phase 2
In which of the following molecules, all atoms are coplanar?
A
B
C
D
Explanation
Biphenyl is coplanar as all carbon atoms are sp2
hybridised.
3
MCQ (Single Correct Answer)
AIPMT 2015 Cancelled Paper
Given :
The enthalpy of hydrogenation of these compounds will be in the order as
A
II > III > I
B
II > I > III
C
I > II > III
D
III > II > I
Explanation
Enthalpy of hydrogenation is inversely proportional to the stability of alkenes.
Stability of alkenes : I $$>$$ II $$>$$ III
Enthalpy of hydrogenation : I $$<$$ II $$<$$ II
4
MCQ (Single Correct Answer)
AIPMT 2015 Cancelled Paper
A single compound of the structure,
is obtainable from ozonolysis of which of the following cyclic compounds?
A
B
C
D
Explanation
Questions Asked from Hydrocarbons
On those following papers in MCQ (Single Correct Answer) Number in Brackets after Paper Name Indicates No of Questions
