Bond energy H-H,F-F and H-F bonds are 10...

Bond energy `H-H,F-F and H-F` bonds are 104, 38 and 135 Kcal `"mol"^(-1)`, respectively. The resonance energy in the `H-F` molecule will be

A

142 Kcal `"mol"^(-1)`

B

66 kcal `"mol"^(-1)`

C

`72.14` kcal `"mol"^(-1)`

D

`79.26` kcal `"mol"^(-1)`

Text Solution

Verified by Experts

The correct Answer is:

C

Resonance energy,
`Delta _(H-F)=(BE)_(H-F)- sqrt((BE)_(H_(2))(BeE)_(F_(2)))`
`=135-sqrt(104xx38)`
`=135-62.86=72.14 "kcal mo"^(-1)`

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