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Which of the following options is the co...

Which of the following options is the correct order of relative stabilities of cations I, II and III as written below (most stable first) ?
(I) (II) `H_2C=CH-CH_2-overset(+)(CH)-CH_3` (III) `H_3C-overset(CH_3)overset(|)underset(CH_3)underset(|)C-overset(+)CH_2`

A

`I gt II gt III`

B

`II gt III gt I`

C

`III gt I gt II`

D

`I gt III gt II`

Text Solution

Verified by Experts

The correct Answer is:
A
`underset("stabilised")underset("Hyperconjugation")(CH_2=CH-CH_2-overset(o+)CH-CH_3)gtunderset("effect stabilised")underset("Inductive")undersetunderset(CH_3)(|)oversetoverset(CH_3)(|)(CH_3-C-underset(o+)(CH_3))`
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