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Physical Properties of Alkynes

The correct o...

Question

The correct order of C - H bond length in $C H_{3} - C H_{3}, C H_{2} = C H_{2}$ and $C H \equiv C H$ is:

C H_{3} - C H_{3} < C H_{2} = C H_{2} < C H \equiv C H

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C H_{2} = C H_{2} < C H_{3} - C H_{3} < C H \equiv C H

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C H \equiv C H < C H_{2} = C H_{2} < C H_{3} - C H_{3}

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Solution

The correct option is C $C H \equiv C H < C H_{2} = C H_{2} < C H_{3} - C H_{3}$
$C - H$ bond length in the shown order are based on $s p, s p^{2}$ and $s p^{3}$ hybridisations. $s p^{3}$ has the highest bond length followed by $s p^{2}$ and $s p$ . So, the correct answer is option (c).

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