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The bond dissociation energy of methane ...

The bond dissociation energy of methane and ethane are 360 kJ `"mol"^(-1)` and 620 kJ `"mol"^(-1)` respectively. Then, the bond dissociation energy of C-C bond is _____

A

`"170 kJ mol"^(-1)`

B

`"50 kJ mol"^(-1)`

C

`"80 kJ mol"^(-1)`

D

`"220 kJ mol"^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
C
`4E_(C-H) ="360 kJ mol"^(-1)`
`E_(C-H)="90 kJ mol"^(-1)`
`E_(C-C)+6E_(C-H) ="620 kJ mol"^(-1)`
`E_(C-C) + 6xx90 = "620 kJ mol"^(-1)`
`E_(C-C)+540="620 kJ mol"^(-1)`
`E_(C-C)="80 kJ mol"^(-1)`
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