Chemistry-
General
Easy
Question
Preparation of alkyl halides in laboratory is least preferred by
- Halide exchange
- Direct halogenation of alkanes
- Treatment of alcohols
- Addition of hydrogen halides to alkenes
The correct answer is: Direct halogenation of alkanes
Direct halogenation of alkenes is not preferred because in it a mixture of monohalogen, dihalogen, trihalogen and tetrahalogen substituted product is obtained which is difficult to separate.
e.g. 
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