Q.

Most stable arenium ion among the following is

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a

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b

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c

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d

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answer is D.

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Detailed Solution

  •  In electrophilic substitution reactions of benzene electrophile forms sigma bond with benzene ring generating positively charged arenium ion containing one SP3 hybridised carbon atom, and according to huckel rule arenium is no longer aromatic it becomes non aromatic.
  • NO2is a electron withdrawing group, so positive charge is not stable on it.
  •  CH3 is a electron releasing group due to its + I effect it stabilizes the positive charge. 
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Most stable arenium ion among the following is