NEET AIPMT SOLVED PAPER 2003

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

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

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

    C)                 Sigma-bond is stronger than a pi-bond

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

    Correct Answer: D

    Solution :

                    Bond energy of sigma and pi bonds are not of the order of 264 kJ/mol and 347 kJ/mol respectively. The bond energy of C-C is 347 k J/mol and for C = C is 619 kJ/mol.

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