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During nitration of benzene withnitrating mixture, `HNO_(3)` acts as
A. Base
B. Acid
C. Reducing agent
D. Catalyst

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Correct Answer - A
Nitration is electrophilic substitution reaction and electrophile is nitronium ion `(-NO_(2)^(+))`. It is produced by transfer of proton from sulphuric acid to nitric acid. Hence `HNO_(3)` acts as a base.

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