5140

Write a structure which satisfies the information given for each of the lettered compounds;

Compound A, C₄H₆O, l_max 219 nm, and compound B of the same molecular formula with no maximum in the ultraviolet, but only end absorption down to 195 nm. Compound C, C₈H₁₂, shows an ultraviolet spectrum with l_max 265 nm. Compound C produces p-xylene in the reaction shown below: