Q.

The (C-H) bond length order in hydrocarbons in which the hybridisation of carbon is sp3 or sp2 or sp

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a

sp3-s>sp2-s>sp-s

b

sp-s=sp2-s=sp3-s

c

sp-s>sp2-s>sp3-s

d

sp3-s>sp-s>sp2-s

answer is C.

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Detailed Solution

The bond length in hydrocarbon when the adjacent carbon has different hybridisation is in order.

Hydrocarbon:    Ethane      Ethene       Ethyne
Bond length   1.09A°>1.076A°>1.06A°

sp3-s>sp2-s>sp -s

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The (C-H) bond length order in hydrocarbons in which the hybridisation of carbon is sp3 or sp2 or sp