C6h6 + пропен(h3po4) -> a a+br2(hv)-> b b+koh(c2h5oh)-> c c+h2(ni)-> d

1)C6H6+CH3CH=CH2 ---> C6H5CH(CH3)2
2)C6H5CH(CH3)2+Br2 ---> C6H5CBr(CH3)2+HBr
3)C6H5CBr(CH3)2+KOH(спирт) ---> C6H5C(CH3)=CH2+KBr+H2O
4)C6H5C(CH3)=CH2+H2 ---> C6H5CH(CH3)2