Arrange stability of the given carbocations in decreasing order
A
iii > ii > i > iv
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B
i > ii > iii > iv
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C
iii > i > ii > iv
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D
ii > iii > i > iv
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Solution
The correct option is C iii > i > ii > iv Stability depends upon the order of + R effect. +R effect is shown by electron donating groups. −NH2,−O−CH3and−OH are electron donating groups. The order of electron donating groups are −NH2>−O−CH3>−OH. So, the correct answer will be option(c).