Question

Write the molecular formula of first two members of homologous series having functional group −Br.

Answer 1

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

The two consecutive members of this series are: 

a. CH₃Br(Bromomethane)

b. CH₃CH₂Br (Bromoethane)
where n is 1 and 2 respectively
​The molecular formula for both of them are CH₃Br and C₂H₅Br.