a,\(nCH_2=CH-CH=CH_2+\) \(nC_6H_5CH=CH_2\xrightarrow{{t^0},p,xt} \)
\((-CH_2-CH=CH-CH_2-CH-CH_2-)_n\)
\
\(C_6H_5\)
b,\(nC{H_2} - CH = CH - C{H_2}\) \( + nC{H_2} = CH - CN\xrightarrow{{t^o},p,xt} \)
\({( - C{H_2} - CH = CH - C{H_2} - CH - C{H_2} - )_n}\)
\
CN