MCQ
A solution of optically active $1$ -phenylethanol racemizes in acidified aqueous medium. It is due to
- Aenolization
- ✓carbonium ion formation
- Ccarbanion formation
- Dreversible oxidation-reduction

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$XeF_5^\Theta ,SO_3^{2 - },SO_4^{2 - },ClO_4^ - ,PO_4^{3 - },NO_2^ + $

| List $I$ Isomeric pairs | List $II$ Type of isomers |
| $A$ Propanamine and $N-$Methylethanamine | $I$ Metamers |
| $B$ Hexan$-2-$one and Hexan$-3-$one | $II$ Positional isomers |
| $C$ Ethanamide and Hydroxyethanimine | $III$ Functional isomers |
| $D$ $o-$nitrophenol and $p-$nitrophenol | $IV$ Tautomers |
Choose the correct answer from the options given below :-
$NH_4NO_3(s) \rightarrow N_2O(g) + 2H_2O(l)$