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Why does C–H bond length decrease in the order C₂H₆ > C₂H₄ > & C₂H₂?

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Why does C–H bond length decrease in the order C2H6 > C2H4 > & C2H2? 

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Because the hybridisation on the C-atoms of these are SP3, SP2 and SP respectively .

The p-orbitals are bigger in size and p–character decreases in the order SP3> SP2 > SP

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