The order of reactivity of following alcohols with halogen acids is:
I. | |
II. | |
III. |
1. (I) >(II)> (III)
2. (III) >(II) >(I)
3. (II) >(I)> (III)
4. (I) >(III)> (II)
The generation of carbocations with the present three alcohol substrates in terms of the reaction mechanism is as follows:.
Here 1° carbocation formation occurs through protonation of 1° -OH followed by a nucleophilic attack.
Here occurs which is comparatively more stable than primary alcohol.
the rate of SN1 mechanism will increase as stability of carbocation will increase
Similarly, the tertiary carbocation formed from tertiary alcohol is most stable so therefore here the rate of reaction by SN1 mechanism is highest.
So, the correct option is second
Conclusion:- Higher the stability of carbocation intermediate higher will be the rate of halogenation of given alcoholic substrates by haloacids.
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