What are alkyl halides? How is n-propyl bromide prepared from propylene?

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Solution

When one or more H-atoms of aliphatic hydrocarbons are replaced by halogen atoms, the resulting compounds so obtained are called halogen derivatives of alkane or alkyl halide. The general formulae of alkyl halide is $C_{n} H_{2 n + 1} - X$ , where $X = C l, B r, I$ .
Example: $C H_{3} - C l$ (Methyl Chloride), $C H_{3} - B r$ (Methyl bromide), $C_{2} H_{5} B r$ (Ethyl Bromide), $C_{3} H_{7} - B r$ (Propyl bromide) etc.
The reaction of propylene with hydrogen bromide in presence of peroxide or oxygen or light forms n-propyl bromide as a major product.
$C H_{3} C H = C H_{2} P r o p y l e n e + H B R H y d r o g e n B r o m i d e P e r o x i d e ⟶ C H_{3} C H_{2} C H_{2} B r n - p r o p y l b r o m i d e (m a j o r p r o d u c t)$ .

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