Order of reactivity of $C_{2} H_{6}, C_{2} H_{4}$ and $C_{2} H_{2}$ is :

C_{2} H_{6} > C_{2} H_{4} > C_{2} H_{2}

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C_{2} H_{2} > C_{2} H_{6} > C_{2} H_{4}

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C_{2} H_{4} > C_{2} H_{2} > C_{2} H_{6}

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All are equally reactive

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Solution

The correct option is C $C_{2} H_{4} > C_{2} H_{2} > C_{2} H_{6}$
Unsaturated hydrocarbons are more reactive than saturated hydrocarbons.

Among alkene and alkyne, the alkene is more reactive because $C \equiv C$ is quite a strong bond.

$∴$ The correct order of reactivity:

$Alkene > alkyne > alkane$

$C_{2} H_{4} > C_{2} H_{2} > C_{2} H_{6}$

Ethene Ethyne Ethane

Hence, option C is correct.

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