Which catalyst is used in the preparation of Teflon?

Which of the following is the common monomer for the polymers Bakelite and Melamine?

The monomer of neoprene is

The correct functional group $X$ and the reagent/reaction conditions $Y$ in the following scheme are:
$X-(CH_2)_4-X \xrightarrow{Y} \text{condensation polymer}$
$(i) \text{ with } HOOC-(CH_2)_4-COOH / \text{heat}$
$(A) X = COOCH_3, Y = H_2 / Ni / \text{heat}$
$(B) X = CONH_2, Y = H_2 / Ni / \text{heat}$
$(C) X = CONH_2, Y = Br_2 / NaOH$
$(D) X = CN, Y = H_2 / Ni / \text{heat}$

$Zinc$ acetate - $antimony$ trioxide catalyst is used in the preparation of which polymer?

Which polymer is formed by chloroethene?