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Arrange the following alkanes in decreas...

Arrange the following alkanes in decreasing order of their heats of combustion.
(i) `CH_(3)-overset(CH_(3))overset(|)underset(("Neo-pentane")(i))underset(CH_(3))underset(|)(C)-CH_(3)` (ii) `CH_(3)-underset((Iso-pentane)(ii))underset(CH_(3))underset(|)(CH)-CH_(2)-CH_(3)`
(iii) `CH_(3)-CH_(2)-underset(("n-pentane"))(CH_(2)-CH_(2)-CH_(3)`

A

`(i) gt (ii) gt (iii)`

B

`(iii) gt (i) gt (ii)`

C

`(iii) gt (ii) gt (i)`

D

`(i) gt (iii) gt (ii)`

Text Solution

Verified by Experts

The correct Answer is:
c
(iii) is most stable because of less steric repulsion `:.` least of combustion.
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