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Which of the following statement is not ...

Which of the following statement is not correct for sigma and pi- bonds formed between two carbon atoms ?

A

A sigma bond is stronger tha a pi bond.

B

Bond energies of sigma and pi bonds are of the order of `264kJ mol^(-1)` and `347 kJmol^(-1)`, respectively.

C

Free rotation of atoms about a sigma bond is allowed but not in case of a pi bond.

D

A sigma bond determines the direction between C atoms but a pi bond has no primary effect in this regard.

Text Solution

Verified by Experts

The correct Answer is:
B
Since a sigma bond is stronger than a `pi` bond, bond energy of sigma bond must be greater than that of `pi` bond. In fact, the bond energy of `C-Csigma` bond is `347 kJ "mol"^(-1)` while the bond energy of `C-Cpi` bond is `272kJ "mol"^(-1)`.
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