Can anyone help me to explain these questions 1-At what point can we stop doing

Question

Can anyone help me to explain these questions

1-At what point can we stop doing recrystallizations and judge that our compound is very close to being 100% pure?

2-Why is the sodium hydroxide added alternately with the acid chloride rather than in one portion at the very beginning of the procedure?

3-Which do you expect to be more reactive with an amine, an acid chloride or a carbomyl chloride ? Explain your answer using molecular structures.

4-Why is one equivalent of triethylamine added to the reaction mixture?

5-states that “the reaction temperature is kept moderate to minimize N-acylurea formation.” Suggest a mechanism for the formation of such a by-product. (HINT: consider the intermediates in the mechanism of the desired reaction).

Explanation / Answer

At what point can we stop doing recrystallizations and judge that our compound is very close to being 100% pure?

When we get the correct melting point of the given compound we can doing recrystallizations and judge that our compound is very close to being 100% pure

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