Give plausible explanation for each of the following:
There are two –NH2 groups in semicarbazide. However, only one is involved in the formation of semicarbazones.
The study of semicarbazide (NH3 derivative of urea,
revel that two N—H bonds of NH2 group away from CO group in semicarbazide are comparatively weaker than two N—H bonds at other –NH2 closer to >C = O group and produces H+ easily for protonation of >C = O group of aldehyde or ketone.

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