Two condensation polymers are made (1) ethylene diamine + ethane–1, 2– dicarboxylic acid (2) trimethylenediamine + ethane–1, 2– dicarboxylic acid if both polymers of same molecular weight are obtained then which of the following statements is/are correct ? (i) Polymer (1) is found to melt at lower temperature. (ii) Polymer (2) is found to melt at lower temperature. (iii) H-bonding is major factor. (a) (i), (ii) and (iii) (b) Only (ii) (c) (i) and (iii) (d) (ii) and (iii)

    

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Two condensation polymers are made

(1) ethylene diamine + ethane–1, 2– dicarboxylic acid

(2) trimethylenediamine + ethane–1, 2– dicarboxylic acid

if both polymers of same molecular weight are obtained

then which of the following statements is/are correct ?

(i) Polymer (1) is found to melt at lower temperature.

(ii) Polymer (2) is found to melt at lower temperature.

(iii) H-bonding is major factor.

(a) (i), (ii) and (iii) (b) Only (ii)

(c) (i) and (iii) (d) (ii) and (iii)

Answer:

 (d) Number of hydrogen bonds is greater in polymer (1)

than in (2) as the density of amide bond is greater in (1)

therefore the chain links to each other strongly in (1)

than in (2) hence (1) melts at higher temperature.