Which nitro compound will show tautomerism ?

(a) ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{NO}}_2$

(b) $({\mathrm{CH}}_3{)}_3{\mathrm{CNO}}_2$

(c) ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{NO}}_2$

(d) o-nitrotoluene

The reduction of CH₃CN to CH₃CH₂NH₂ is called:

(a) Rosenmund's reduction

(b) Clemmensen's reduction

(c) Mendius reduction

(d) Hofmann's reduction

The product [A] formed in the reaction;

$2{\mathrm{C}}_5{\mathrm{H}}_5-\mathrm{CN}\underset{{\mathrm{Et}}_2\mathrm{O}}{\overset{\mathrm{Na}}{\to }}\left[A\right] \mathrm{is}:$

The product is: 

In the compound given below,

the correct order of acidic nature of the positions (X), (Y) and (Z) is: 

(a) Z>X>Y

(b) X>Y>Z

(c) X>Z>Y

(d) Y>X>Z

Aniline was acetylated and an acetanilide is formed. The acetanilide on nitration followed by alkaline hydrolysis gave:

1. o-Nitroacetanilide

2. o- and p-Nitroaniline

3. m-Nitroaniline

4. Acetanilide

In the chemical reactions,

$\underset{\mathrm{HCl}, 278 \mathrm{K}}{\overset{{\mathrm{NaNO}}_2}{\to }}A\stackrel{HB{F}_4}{\to }B$

the compounds 'A' and 'B' respectively are:

1. nitrobenzene and chlorobenzene

2. nitrobenzene and flurobenzene

3. phenol and benzene

4. benzene diazonium chloride and fluorobenzene

Which of the following reactions is appropriate for converting acetamide to methanamine ?

(1) Carbylamine reaction

(2) Hoffmann Bromamide reaction

(3) Stephens reaction

(4) Gabriels phthalimide synthesis

Which one of the following nitro-compounds does not rect with nitrous acid ?

A given nitrogen-containing aromatic compound a reacts with Sn/HCl, followed by HNO₂ to give an unsatable compound B.B, on treament with phenol, forms a beautiful coloured compound C with the molecular formula C₁₂H₁₀N₂O. The structure of compound A is