Butan-2-ol may be prepared by reducing $X$ using $\text{H}_2/\text{Ni}$. Butan-2-ol may then be dehydrated to produce $Y$ and $Z$, which are structural isomers of one another. Which row is correct?
- AX is an aldehyde; both Y and Z show cis-trans isomerism
- BX is an aldehyde; only one of Y and Z shows cis-trans isomerism
- CX is a ketone; both Y and Z show cis-trans isomerism
- DX is a ketone; only one of Y and Z shows cis-trans isomerism