how to identify the consecutive members of element of functional groups ?

for example: name the consecutive members of Aldehydes? 

Dear Student,

Please find below the solution to the asked query:

The members of particular homologous series of functional group differ from each other by the number of CH₂ units in the main carbon chain.

For example : The first member of aldehyde is methanal (HCHO) . The second member will be CH₃CHO ( Ethanal) . There will be difference of -CH₂ unit in each member. The next members will be propanal , butanal and so on.
 

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