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If propionyl chloride is added to one equivalent of methylamine, only a 50% yield of N-methylpropanamide...

If propionyl chloride is added to one equivalent of methylamine, only a 50% yield of N-methylpropanamide is obtained. If, however, the acyl chloride is added to two equivalents of methylamine, the yield of N-methylpropanamide is almost 100%. Draw all the products of this reaction for explain these observations.

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