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The compound that is most reactive towards electrophilic nitration is:
A. Toluene
B. Benzene
C. Benzoic acid
D. Nitrobenzene

Answer
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Hint: We know that nitration is a reaction in which a nitro group displaces a hydrogen atom in a compound. A nitro group is an electron withdrawing group and nitration happens to that compound if the compound has an electron releasing group.

Complete step by step answer:
Let’s discuss the possibility of electrophilic nitration in all cases.
Option A is toluene. The structure of toluene is,

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We know that the CH3 group is an electron releasing group. And we know that the nitro group is an electron withdrawing group. So, the electrophilic substitution of the NO2 group is possible here.
Option B is benzene. The structure of benzene is,

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Here, also nitration is possible. But its reactivity towards electrophilic nitration is less than toluene because of absence of electron releasing group. Option C is benzoic acid. The structure of benzoic acid is,

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Here, COOH group is an electron withdrawing group. So, electrophilic nitration is less reactive in benzoic acid than benzene as the nitro group is also an electron withdrawing group.
Option D is nitrobenzene. The structure of nitrobenzene is,

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We know that the nitro group is an electron withdrawing group. So, electrophilic nitration is less reactive than benzene.
So, the compound which is more reactive towards electrophilic nitration is toluene.

So, the correct answer is Option A.

Note: Always remember that substituents having pi bonds to electronegative atoms (C=O, -NO2) adjacent to the pi system are electron withdrawing groups. They deactivate the aromatic ring by decreasing electron density on the ring by resonance.

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