The $C - H$ bond distance is the longest in :

C_{2} H_{2}

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C_{2} H_{4}

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C_{2} H_{6}

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C_{2} H_{2} B r_{2}

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Solution

The correct option is C $C_{2} H_{6}$
$C_{2} H_{6}$ is a saturated hydrocarbon and its carbon is $s p^{3}$ hybridised. Hence it is least electronegative among alkanes, alkenes and alkynes. Hence, the $C - H$ bond length will be maximum in $C_{2} H_{6}$ .

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The C-H bond distance is longest in:

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Which of the following has longest C-O bond length? (Free C-O bond length in CO is 1.128 A.)

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1.128 \circ A

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