Question

why bond energy of c=c is least than c-c?

Answer 1

hey mate is your answer

c=c bond is more stronger than c-c bond as it forms a covalent bond i.e. formed by mutual sharing of electrons.

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Answer 2

hey friend this is your answer

it is because the bond length between carbon and hydrogen is smaller than between carbon and carbon so more energy is needed for atomization as the effective nuclear charge on the bonded pair of electrons will be greater

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