# Which of the following are correct?(i)   is more stable than (ii)  less table than (iii)  is more stable than (iv)  is more stable than

The answer is the option is more stable than & (iii) is more stable than .

Explanation: is more stable than  because +R effect of is greater than (stability of carbocation increases due to the +R effect).

(iii) We know that the resonance effect is stronger than +I effect. Here, $CH_{2}=CH-CH_{2}^{+} \leftrightarrow ^+CH_{3}-CH=CH_{2}$ is stabilised by resonance effect; whereas  is stabilised by +I effect only . Hence,  is more stable than .

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