MCQ
The structure (figure) would be best classified as a(an)


- AAcetal
- ✓Hemiacetal
- CHydrate
- DCyanohydrin

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$CH _{3} CH _{2} CH _{3} \stackrel{?}{\longrightarrow} CH _{3} CH _{2} CHO$
$C{{H}_{3}}CN+2H\underset{\text{Ether}}{\mathop{\xrightarrow{HCl}}}\,X\xrightarrow{\text{Boiling }{{H}_{2}}O}Y;$ the term Y is
$(A)$ $\left[\mathrm{Pt}(\mathrm{en}) \mathrm{Cl}_2\right]$ $(B)$ $\left[\mathrm{Pt}(\mathrm{en})_2\right] \mathrm{Cl}_2$
$(C)$ $\left[\mathrm{Pt}(\text { en })_2 \mathrm{Cl}_2\right] \mathrm{Cl}_2$ $(D)$ $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_2 \mathrm{Cl}_2\right]$
The order of decreasing reactivities of these alcohols towards substitution with $HBr$ is