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The enthalpy of combustion of H(2) , cyc...

The enthalpy of combustion of `H_(2)` , cyclohexene `(C_(6)H_(10))` and cyclohexane `(C_(6)H_(12))` are `-241` , `-3800` and `-3920KJ` per mol respectively. Heat of hydrogenation of cyclohexene is

A

`-121` KJ per mol

B

`+121` KJ per mol

C

`+242` KJ per mol

D

`-242` KJ per mol

Text Solution

Verified by Experts

The correct Answer is:
A

`DeltaH=[DeltaH` of combustion of cyclohexane -`(DeltaH` of combustion of cyclohexene + `DeltaH` of combustion of `H_(2))]`
`-[-3920 -(-3800-241)] KJ`
`=-[-3920-(-3800-241)] KJ`
`-[-3920 + 4041 KJ =-[121] KJ =-121 KJ`
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