An optically active monoterpene (compound A) with molecular formula undergoes catalytic hydrogenation to form an optically inactive

Question:

An optically active monoterpene (compound A) with molecular formula undergoes catalytic hydrogenation to form an optically inactive compound with molecular formula C10H20O (compound B). When compound B is heated with acid, followed by reaction with O3.and workup under reducing conditions (Zn,H2O),one of the products obtained is 4-methylcyclohexanone. Give possible structures for compound A.