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In the diazotization of arylamines with sodium nitrite and hydrochloric acid, an excess of hydrochloric acid is used primarily to
(a)suppress the concentration of free aniline available for coupling.
(b)suppress hydrolysis of phenol.
(c)ensure a stoichiometric amount of ntirous acid.
(d)neutralise the base liberated.

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Important Questions on Amines
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Can the amino group, in the aniline molecule, become meta-directing in an electrophilic substitution reaction?

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