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Homolytic bond dissociation energy of C-...

Homolytic bond dissociation energy of `C-H` bond is minimum for

A

`CH_(3)CH_(2)-H`

B

`(CH_(3))_(2)-H`

C

`(CH_(3))_(3)C-H`

D

`C_(6)H_(5)CH_(2)-H`

Text Solution

Verified by Experts

The correct Answer is:
D
Homolytic bonds dissociation energy of `C-H` bonds is inversly related to the stability of free radical formed. Thus, the more stable the radical, the lesser the bond disociation enrgy. Since the order of stability is
`C_(6)H_(5)CH_(2)gt (CH_(3))_(3_ Cgt (CH_(3))_(2))CH gt CH_(3)CH_(2)`
the order of bonds dissociation energy is as follows:
`underset(410KJmol^(-))(C)H_(3)CH_(2)-Hunderset(395KJmol^(-1))((CH_(3))_(2))CH-H gt underset(381KJ mol^(-1))((CH_(3))_(3))-Hgt underset(356KJmol^(-1))(C_(6)H_(5)CH_(2)-H`
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