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19 March, 08:09

In the first step, 4-sulfanilic acid reacts with sodium nitrate to form diazonium ion intermediate. Identify the Lewis acid and Lewis base in this reaction.

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  1. 19 March, 11:44
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    In the formation of diazonium ion intermediate, the 4-sulfanilic acid acts as the Lewis acid, while the sodium nitrite is the Lewis base.

    Explanation:

    A Lewis acid is by definition an electron pair acceptor (such as the H + ion, that can accept a pair of non-bonding electrons) and a Lewis base is an electron pair donor (such as the OH - ion, that can donate a pair of non-bonding electrons).

    In the formation of diazonium ion intermediate, the 4-sulfanilic acid acts as the Lewis acid (by transference of a lone pair from its nitrogen atom), while the sodium nitrite is the Lewis base.

    N. B its sodium nitrite, NaNO2 (which is slightly basic in solution) not nitrate NaNO3 (which is neutral in solution)
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