The polymer Nylon-6,6 can be synthesized by reacting hexanedioic acid, HOOC(CH2)4COOH\text{HOOC(CH}_2\text{)}_4\text{COOH}HOOC(CH2)4COOH, with hexane-1,6-diamine, NH2(CH2)6NH2\text{NH}_2\text{(CH}_2\text{)}_6\text{NH}_2NH2(CH2)6NH2.
Which small molecule is also produced during this polymerization reaction?
HCl\text{HCl}HCl
H2O\text{H}_2\text{O}H2O
NH3\text{NH}_3NH3
CO2\text{CO}_2CO2