Chemistry - GOC Question with Solution | TestHub

Degree of unsaturation of ${\mathrm{C}}_{10}{\mathrm{H}}_{18}\mathrm{O}=2$, but it contains no double or triple bond. Hence there are two rings - one six membered as indicated by product and the other three membered which is cleaved by $\mathrm{HCl}$ due to strain. Hence $A$ has following structure.