MHT CET Chemistry Model Test 04 — MHT - CET STD 12 Science — Question

I. $\begin{array}{cc}
\ce{-(CH2 - CH -)_{{n}}}\\
\phantom{....}|\\
\phantom{.......}\ce{C6H5}
\end{array}$

II. $\ce{-(CH2 - CH = CH - CH2 -)_{{n}}}$

III. $\ce{-(CO(CH2)4 - CONH(CH2)6NH -)_{{n}}}$

IV.