Question

the third member of the homologous series of aliphatic aldehydes is​

Answer 1

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The third member of the aldehyde homologous series would be Propionaldehyde.

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Answer 2

The third member of the homologous series of aliphatic aldehydes is​ $CH_3CH_2CHO$ (propanal)

Explanation:

A homologous series is a series of compounds with the same functional group and similar chemical properties in which the members of the series differ by the number of repeating units they contain.

The functional group which represents aldehydes is and has suffix -al. The first member of aldehyde is $HCHO$ with one carbon atom is methanal. The homologous series which differ by a $-CH_2$ unit will have ethanal $(CH_3CHO)$ and propanal $(CH_3CH_2CHO)$) containing 2 and 3 carbon atoms respectively as second and third member of the homologous series of aliphatic aldehydes.

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