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The S(N)1 reactivity of the following ha...

The `S_(N)1` reactivity of the following halides will be in the order
(i) `(CH_(3))_(3)CBr`
(ii) `(C_(6)H_(5))_(2)CHBr`
(iii) `(C_(6)H_(5))_(2)C(CH_(3))Br`
(iv) `(CH_(3))_(2)CHBr`
(v) `C_(2)H_(5)Br`

A

a) (v) `gt` (iv) `gt` (i) `gt` (ii) `gt` (iii)

B

b) (ii) `gt` (i) `gt` (iii) `gt` (v) `gt` (iv)

C

c) (i) `gt` (iii) `gt` (v) `gt` (ii) `gt` (iv)

D

d) (iii) `gt` (ii) `gt` (i) `gt` (iv) `gt` (v)

Text Solution

Verified by Experts

The correct Answer is:
D
`S_(N)1` (Unimolecular nucleophilic substitution reaction)
Rate `prop` (substrate)
Rate of determining stepin the formula of carbocation depends on the stability of carbocation formed. The stability of carbocations follow the order
`(C_(6)H_(5))_(2)C^(+)(CH_(3))gt(C_(6)H_(5))_(2)overset(+)CHgt(CH_(3))_(2)overset(+)(C)HgtCH_(3)CH_(2)^(+)`
`because` Order of `S_(N)1` reactivity is
`(C_(6)H_(5))_(2)C(CH_(3))Brgt(C_(6)H_(5))_(2)CHBrgt`
`(CH_(3))_(3)CBrgt(CH_(3))_(2)overset(+)CHBrgtC_(2)H_(5)Br`
i.e., (iii) `gt` (ii) `gt` (i) `gt` (iv) `gt` (v)
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