why is the formation of a condensation polymer impossible in these cases ?
A) ethanoic acid + NH2CH2CH2CH2CH2NH2
B) ethanoic acid+CH3CH2NH2
C) HOOC-CH2-COOH + CH3CH2NH2
The formation of a condensation polymer involves the joining of two monomers with the elimination of a small molecule, such as water or alcohol. In these cases, the formation of a condensation polymer is not possible due to the absence of a suitable small molecule that can be eliminated during the polymerization process.
Let's break down each case:
A) Ethanoic acid + NH2CH2CH2CH2CH2NH2:
Ethanoic acid (CH3COOH) contains a carboxylic acid group (COOH), which can react with a nucleophilic group to form an ester linkage, eliminating water in the process. However, in this case, NH2CH2CH2CH2CH2NH2, which is a diamine, does not have a suitable functional group to react with ethanoic acid for the formation of an ester. Therefore, the formation of a condensation polymer is not possible.
B) Ethanoic acid + CH3CH2NH2:
Similar to case A, ethanoic acid has a carboxylic acid group that can react with nucleophiles to form esters. However, CH3CH2NH2, which is ethylamine, is a primary amine without a suitable functional group for ester formation. Hence, the formation of a condensation polymer is not possible here either.
C) HOOC-CH2-COOH + CH3CH2NH2:
HOOC-CH2-COOH, also known as oxalic acid, has two carboxylic acid groups, but CH3CH2NH2 is still a primary amine, which lacks the necessary functional group for ester formation. Thus, the reaction between these two compounds cannot lead to the formation of a condensation polymer.
In conclusion, the absence of a suitable functional group on the amine compounds prevents the required elimination of a small molecule (such as water) during polymerization.