Question
How are the following pairs related?$\text{C}_2\text{H} _4$ and $\text{C}_3\text{H} _7\text{Cl}$
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Answer
$\text{C}_2\text{H}_5\text{Cl}$ and $\text{C}_3\text{H}_7\text{Cl}$ differ by a - $CH_2$ unit. Also these 2 can be represented by the formula $\text{C}_\text{n}\text{H}_\text{2n+1}\text{Cl}.$l. Therefore they are homologues.
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