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S(N)1 reaction undergoes through a carbo...

`S_(N)1` reaction undergoes through a carbocation intermediate as follows:
`R-x(aq.)overset(Slow)(hArr) R^(-)(aq.)+X^(-)(aq.) underset("fast")overset(H_(2)O)toROH(aq.)+H^(-)(aq.)`
`[R=t-Bu,iso-Pr,Et,Me](X=Cl,Br,I)`
The correct statements are
I. The decreasing order of rate of `S_(N)1` reaction is `t-BuXgtisoPrXgtEtXgtMeX`
II. The decreasing order of ionisation energy is `MeXgtEtXgtiso-PrXgtt-BuX`
III. The decreasing order of energy of activation is `t-BuXgtiso-PrXgtEtXgtMeX`

A

I & II are correct

B

I & III are correct

C

II and III are correct

D

I,II & III are correct

Text Solution

Verified by Experts

The correct Answer is:
A
Rate of `S_N1` reaction is a t Bu X gt iso-prXgt EtX gt MeX
So order of activation energy
t-BuXltisoPrXltEtXltMeX
order of ionisation energy
1 BuX ltiso prX lt EtX lt MeX
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