Q.

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

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a

Sigma-bond determines the direction between carbon atoms but a pi-bond has no primary effect in this regard

b

Sigma-bond is stronger than a pi-bond

c

Bond energies of sigma- and pi-bonds are of the order of 264 kJ/mol and 347 kJ/mol, respectively

d

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

answer is C.

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Detailed Solution

As sigma bond is stronger than the π (pi) bond, so it must be having higher bond energy than π (pi) bond.

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