Answer
a) General representation for the formula of an Alkyl bromide is : $R-Br$ where R = Alkyl group ($-CH_{3}, -CH_{2}CH_{3} $ etc.)
b) Aryl bromides are represented as $Ar-Br$
where Ar means Aryl group i.e. groups having benzene ring in them. for example Phenyl group ($-C_{6}H_{5}$)
Work Step by Step
Alkyl bromide is formed when a bromine atom is substituted in place of a H atom bonded with Alkane.
Aryl bromide is formed when a bromine atom is substituted in place of a H atom bonded with benzene ring.
