1.

Consider the following compounds 1. CH_(3)CH_(2)CH_(2)Br "" 2 CH_(2)CHBrCH_(3) 3. (CH_(3))_(3)CBr These compounds are dehydrohalgenated by treatement with strong base under indentical condition. The correct sequence of reactivity of these compounds in the given reaction is

Answer»

`1 gt 2 gt 3`
`2 gt 1 gt 3`
`3 gt 1 gt 2`
`3 gt 2 gt 1`

Solution :As we proceed along a series of alkyl halide from `1^(@) " to" 2^(@) "to" 3^(@)`, th STRUCTURE becomes more branched at the carbon carrying the halogen atom. This increases branching has two result.
i. It providees a greater number of `beta`- hydrogenes for ATTACK by base, and hence, a more favorable probability factor towards elimination.
i It leads to more HIGHLY branched, more stable alkene. Thereofore, in dehydro halogenation, the increasing order of reactivity of alkyl halides is
`3^(@) gt 2^(@) gt 1^(@) gt OR3 gt 2 gt 1 `


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