NEET Sample Paper NEET Sample Test Paper-50

  • question_answer 84) Methane is quite stable whereas silane is unstable? Because-

    A) C ? C bond energy is large greater than Si ? Si bond energy

    B) Si ? H bond energy is much lower than C ? H bond energy

    C) Si has vacant p orbitals which are more susceptible for nucleophilic attack

    D) All of above reasons

    Correct Answer: B

    Solution :

    Si ? H bond energy is 393 kJ/mol Whereas C ? H bond energy is 435 kJ/mol \[Dc-c\simeq \,\,340\,\,kJ/mol\And {{D}_{Si}}{{-}_{Si}}\,=\,\,368\,\,kJ/mol\] C ? C and Si ? Si bond energies are comparable

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