Arrange the following in the decreasing order of C-C length.
I. $C_{2} H_{4}$
II. $C_{2} H_{2}$
III. $C_{6} H_{6}$
IV. $C_{2} H_{6}$

IV > III > I > II

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I > II > IV > III

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II > I > IV > III

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IV > I > III > II

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Solution

The correct option is A IV > III > I > II
The correct order of decreasing $C - C$ bond length is $I V > I I I > I > I I$ .
IV: Butane - has all single bonds making the longest bond lengths.
III: Benzene - has resonance meaning that the C-C bond has equal single bond and douible bond character.
II: Butyne - has a triple bond
I: Butene: has a double bond
More the number of bonds, shorter the bond length.

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