Which of the following statements about the scheme below are true? This is an ac

Question

Which of the following statements about the scheme below are true?

This is an acid-base reaction.

This is an elimination reaction.

This reaction is a major problem if the desired product is the amide.

If the reaction mixture is warmer this won't happen.

This will be the reaction that occurs between these two compounds.

This is an acid-base reaction.

This is an elimination reaction.

This reaction is a major problem if the desired product is the amide.

If the reaction mixture is warmer this won't happen.

This will be the reaction that occurs between these two compounds.

Explanation / Answer

The given reaction scheme is an acid - base reaction (true). Amides can not be prepared by mixing a carboxylic acid with an amine . If an acid and an amine are mixed,an acid-base reaction occurs. The acidic proton is abstracted by the basic nitrogen lone pair resulting in an amine salt of the carboxylic acid, which will not react further.

However,if the water is removed from the ammonium carboxylate solution and the resulting solid heated strongly, water will be eliminated and the amide will be formed.

However, high temperatures required for this reaction also leads to considerable thermal degradation of both the salt and product and therefore very low yields.

With the last option can say this is the reaction occuring afcourse in between these two compounds , but taking two step sequence in which firstly activating the acid into an acyl chloride and then treating it with an amine will lead us correctly to the amide.

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