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If enthalpies of methane and ethane are ...

If enthalpies of methane and ethane are respectively 320 and 360 calories then the bond energy of C - C bond is

A

80 calories

B

40 calories

C

60 calories

D

120 calories

Text Solution

Verified by Experts

The correct Answer is:
D
`CH_(4)` has `4C- H` bond
`E_(C-H)= (320)/(4)= 80`
In `C_(2)H_(6)` there is
`6 rArr C- H` bond and `1 rArr C- C` bond
`360 = E_(C-C) + 6E_(C- H)`
`360 = E_(C-C) + 6 xx 80`
`E_(C-C)= 120` kcal
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