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Nitrous acid for reactions with amines is generated from:
AHNO3 and copper turnings
BNH3 and oxygen gas
CKNO3 heated strongly
DNaNO2 and a mineral acid
Answer & Solution
Correct answer: D. NaNO2 and a mineral acid
Nitrous acid is unstable, so it is made in situ from sodium nitrite and a mineral acid.
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