Arrange the following hydrocarbons on the basis of increasing bond length between carbon atoms:
Ethane, ethyne and ethene.

Ethane < ethene < ethyne

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Ethane < ethyne < ethene

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Ethyne < ethene < ethane

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Ethane < ethene < ethyne

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Solution

The correct option is C Ethyne < ethene < ethane
Ethane is a saturated hydrocarbon while thene and ethyne are unsaturated hydrocarbons.

The given table shows the molecular formula and bonds between the carbon atoms in each of the molecules.
$\begin{matrix} C o m p o u n d & M o l e c u l a r F o r m u l a E t h a n e & C H_{3} - C H_{3} E t h y n e & C H \equiv C H E t h e n e & C H_{2} = C H_{2} \end{matrix}$ The bond length decreases as the number of bonds between two atom increases. Hence, the correct order of bond length is ethyne < ethene < ethane.

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