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Haloalkanes And Haloarenes

Question
CBSEENCH12007788

Explain the reason:

The reactivity order of alkyl bromides is tert alkyl bromide > sec alkyl bromide > primary alkyl bromide.

Solution

i) The given order is follow the SN1 mechanism. In which carbon halogen bond is break and form carbocation and halogen ion.
ii) The carbocation is formed  is then attacked by nucleophile in step to complete the substitution reaction.
According to SN1 mechanism more is stability of carbocation easy is formation of compound. Hence the order of alkyl bromides are given as;
30 > 20 > 10
Since tertiary cation is more stable than secondary  and secondary is more stable than primary.