Question

Write the molecular formula of first two members of homologous series having functional group – OH

Answer 1

The general formula for the homologous series of functional group −OH is C_nH_2n+1OH.

The two consecutive members of this series are: 

a. CH₃OH(Methanol)

b. CH₃CH₂OH (Ethanol)

where n is 1 and 2 respectively
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The molecular formula for both of them are CH₄O and C₂H₆O.