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Arrange the following alkanes in decreas...

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