The correct statement about the products $B$ and
$C$ in the given reactions are$$ \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH} \xrightarrow[\text { Anhy. } \mathrm{ZnCl}_2]{\mathrm{HCl}} A \xrightarrow[\text { AgCN }]{\text { Ethanolic }} \underset{\text { Minor }}{B}+\underset{\text { Major }}{C} $$
I. $B$ and $C$ are functional isomers.
II. With $\mathrm{H}_2 /$ Catalyst $B$ gives $1^{\circ}$ amine and $C$ gives $2^{\circ}$ amine.
III. $B$ on acid hydrolysis given formic acid and C gives $\mathrm{C}_3 \mathrm{H}_6 \mathrm{O}_2$.
IV. $C$ forms isocyanate with HgO
Let $f: R \rightarrow R$ be defined by $f(x)=5^{-|x|}+\operatorname{sgn}\left(5^{-x}\right)$, where sgn $x$ denotes signum function of $x$. Then $f$ is
If the range of the real valued function $f(x)=\frac{x^2+x+k}{x^2-x+k}$ is $\left[\frac{1}{3}, 3\right]$, then $k=$
The value of the greatest integer $k$ satisfying the inequation $2^{n+4}+12 \geq k(n+4)$ for all $n \in N$ is
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