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24 May, 02:18

Decreasing order of C-C bond length is 1) ethene 2) ethyne 3) benzene 4) ethane

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  1. 24 May, 06:12
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    4>3>1>2.

    That is, the C-C bond length in ethane > benzene > ethene > ethyne.

    Explanation:

    The C-C bond in ethane is single, the C-C bond in ethene is double and the C-C bond in ethyne is triple. As the number of bonds between a C-C increases, the length of the bond decreases with an increase in strength. This explains why the C-C bond length in ethane > ethene > ethyne. For benzene, all the C-C bonds in the aromatic compound has been found to have an identical length of 1.40 Å, compared to ethane (1.54Å), ethene (1.34Å) and ethyne (1.20Å). Hence the trend in bond lengths: ethane > benzene > ethene > ethyne.
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