4 . Nylon, a polyamide, is produced from hexanediamine and a substance X. This substance X
is most probably a(n):(A) amine.
(B) carboxylic acid.
(C) ketone.
(D) alcohol.
5 . Intermediates in the Strecker synthesis include all of the following nitrogen-containing
functional groups EXCEPT a(n):(A) nitrile.
(B) imine.
(C) amide.
(D) amine.
6 . A biochemist is synthesizing valine, shown below, using the Strecker synthesis. Which of
the following carbonyl-containing compounds would be an appropriate starting reactant
in this synthesis?(A) 2-Propanone
(B) Propanal
(C) 2-Methylpropanal
(D) Butanal
7 . Why is the CāN bond of an amide planar?