Which one of the following structures represents nylon 6, 6 polymer-

Which one of the following structure represent nylon-6, 6 polymer ?

Which one of the following structures represents the neoprene polymer?

Which one of the following represent nylon 6,6 polymer?

Which one of the following represent nylon 6,6 polymer?

Which of the following represents nylon 6 ?

Structures of nylon-6,6 polymer?

Which one of the following is not a polyamide polymers: (a) Nylon-6,6 (b) Nylon-6,10 ( c) Glylptal (d) Dacron