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Heterolytic bond dissociation energy of ...

Heterolytic bond dissociation energy of `C-Br` bond is minimum for

A

`CH_(3)Br`

B

`CH_(3)CH_(2)Br`

C

`(CH_(3))_(2)CHBR`

D

`(CH_(3))_(3)CBr`

Text Solution

Verified by Experts

The correct Answer is:
D
This bonds dissociation energy is the amount of energy that must be supplied to convert a mole of alkyl bromide into carbocations and bromide ions:
`R-Br-gt R^(+)+Br^(-)`
The order of relative stability of carbocations is as follows:
`3^(@) gt 2^(@) gt 1^(@) gt overset(+)CH_(3)`
because the more stable the carbocation, the lesser the enrgy required to form the carbocation.
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Knowledge Check

  • 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`

  • Correct order of bond dissociation energy

    A
    `Br_(2) gt Cl_(2)`
    B
    `F_(2) gt Cl_(2)`
    C
    `l_(2) gt F_(2)`
    D
    `F_(2) gt l_(2)`

  • in C_(1)-H, C_(2)-H and C_(3)-H the homolytic bond dissociation energy order is :

    A
    `C_(2)-HgtC_(3)-HgtC_(1)-H`
    B
    `C_(2)-HgtC_(3)-HgtC_(1)-H`
    C
    `C_(2)-HgtC_(3)-HgtC_(1)-H`
    D
    `C_(3)-HgtC_(2)-HgtC_(1)-H`