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Statement (A) : C – H bond length in acetylene is 1.06A $°$ and that in ethane is 1.09A $°$ .
Statement (B) : The lower C – H bond length in acetylene is due to sp-s overlapping.
Statement (C) : If in a carbon chain, a carbon is bonded to two other carbon atoms, then it is known as secondary carbon.

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A and B are correct, but C is incorrect

All the above statements are incorrect

All the above statements are correct

A and B are incorrect, but C is correct

answer is A.

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Detailed Solution

C – H bond length in acetylene is $1.06 A °$

C – H bond length in ethane is $1.06 A °$

Lower C – H bond length in acetylene is due to sp – s overlapping

Carbon atoms a, c are 1 $°$ Carbon − atoms carbon atoms b is 2 $°$ Carbon − atom.

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