JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pl106
Take the repeat unit of nylon 2-nylon 6 as one glycine residue plus one 6-aminohexanoic acid residue, −[NH−CHX2−CO−NH−(CHX2)X5−CO]X− (CX8HX14NX2OX2). Which statements are correct (C 12, H 1, N 14, O 16)?
ABoth monomers are amino acids.
BThe repeat unit has a molar mass of 170 g/mol.
CEach repeat unit contains two amide groups.
DIt forms by chain-growth addition polymerisation of alkene monomers.
Answer: A, B, C
Mass =96+14+28+32=170. The repeat unit has two −CO−NHX− groups, made by condensation of two amino acids with loss of water. It is not formed from alkenes.