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State (Phase) of Alkanes

Which of the ...

Question

Which of the following has the maximum $C - H$ bond length?

C_{2} H_{4}

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C_{2} H_{2}

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C_{2} H_{6}

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C_{6} H_{6}

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Solution

The correct option is D $C_{2} H_{6}$
Ethane $C_{2} H_{6}$ has maximum $C - H$ bond length.
Bond length decreases with the increase in s character since an s-orbital is smaller than a $p -$ orbital.
Compound
Hybridization
$C - H$ bond length ( $A^{o}$ )
Alkane
$s p^{3}$
1.093
Alkene
$s p^{2}$
1.087
Alkyne
$s p$
1.057

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