In which of the following structures the electrophilic attack of nitronium ion will place it at meta position?

only

i v

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i i

and

i v

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i i, i i i, i v

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only

i

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Solution

The correct option is B $i i$ and $i v$
In $i i$ and $i v$ of the following structure the electrophilic attack of nitronium ion will place it at meta position.

Trifluoromethyl group $- C F_{3}$ and nitro group $- N O_{2}$ are meta directing groups.

On the other hand, $O^{-}$ and $- C l$ are ortho and para directing groups.

Option B is correct.

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