Question
Find the odd one out: $\mathrm{C}_2 \mathrm{H}_2, \mathrm{C}_3 \mathrm{H}_8, \mathrm{C}_2 \mathrm{H}_6, \mathrm{CH}_4$

Answer

$\mathrm{C}_2 \mathrm{H}_2$ (Others are saturated hydrocarbons.)

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