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Which of the following is/are the advantage for using excess NH3?

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Which of the following is/are the advantage for using excess NH3?

(a) Rapid amination

(b) Complete reaction

(c) Large quantity

(d) All of the mentioned

I got this question during an online exam.

This key question is from Physical and Chemical Properties in chapter Amination by Ammonolysis of Unit Processes

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Correct answer is (d) All of the mentioned

To elaborate: by utilizing a more concentrated NH3 solution for non-catalytic aminations may be summed up as follows: (1) amination is more rapid, (2) conversion of reacting compound to primary amine is more complete, (3) formation of secondary and tertiary amines and hydroxy compounds is inhibited, (4) lower reaction temperatures can be used, and (5) since larger batches can be treated.

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