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Amines

Short Answer Type

261.

Complete and balance each of the following equations:

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262.

Complete and balance each of the following equations:

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263.

Account for the fact that:
Sulphanilic acid is feebly basic.

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264.
Account for the fact that:
p-nitroaniline is a weak base.

There is an important resonance interaction between the amino and nitro groups in p-nitroaniline as shown.

Because of the contribution of this structure to the actual state of the molecule, there is a greater loss of resonance energy when p-nitro aniline is converted to its conjugate base p-NH₃.C₆H₄.NO₂ than when aniline is converted to the anilinium ion, NH₃⁺C₆H₅. Hence, p-nitroaniline is a weaker base than aniline which itself is a weak base.

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