which of the following is ring oppening reaction a Amino aci

which of the following is ring oppening reaction?

a) Amino acids --> protien + water

b) yellow sulfur --> poly(sulfur)

c) propylene --> isotactic poly(propylene)

d) diacid + diamine --> polyamide + water

e) diacid ( two acid carboxylic acid groups) + diol(two alcholic groups) --> poly(ester) + water

Solution

b) yellow sulfur --> poly(sulfur) as yellow sulfur is initially in a 8-membered ring strucutre.