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Homologous Series

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Question

write the molecular formula of two consecutive members of homologous series of aldehydes

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Solution

The general formula for the homologous series of aldehydes are C_nH_2n-1CHO.
The two consecutive members of Aldehyde groups can be CH₃CHO and C₂H₅CHO where n is 2 and 3 respectively.
The molecular formula for both of them are C₂H₄O and C₃H₆O.

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