The presence of ${\mathrm{NH}}_4^{+}$ radical in solution can be detected by:

1. Fehling’s solution

2. Benedict’s solution

3. Schiff's reagent

4. Nessler’s reagent

 

Potassium thiocyanate solution reacts with ferric chloride to give:

(1) pink colour

(2) deep blue colour

(3) green colour

(4) blood-red colour

An organic compound X (mol. formula C₆H₅O₂N) has 6 carbon atoms in a ring system, three double bonds and also a nitro group as substituent X is:

1. Homocyclic but not aromatic

2. Aromatic but not homocyclic

3. Homocyclic and aromatic

4. Heterocyclic

Choose the appropriate sequence to maximize the yield of 3-chloro-aniline from benzene.
 

1. Chlorination, nitration, reduction

2. Nitration, chlorination, reduction

3. Nitration, reduction, chlorination

4. Nitration, reduction, acylation, chlorination, hydrolysis

A reaction that can convert acetamide to methanamine is:

1. Carbylamine reaction

2. Hoffmann bromamide reaction

3. Stephens reaction

4. Gabriels phthalimide synthesis

Which one of the following nitro-compounds does not react 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

The correct statement regarding the basicity of arylamines is

(1) Arylamines are generally more basic than alkylamines because the nitrogen lone-pair electrons are not delocalized by interaction with the aromatic ring p-electron system.

(2) Arylamines are generally more basic than alkylamines because of aryl group.

(3) Arylamines are generally more basic than alkylamines, because the nitrogen atom in arylamines is sp-hybridized

(4) Arylamines are generally less basic than alkylamines because the nitrogen lone-pair electrons are delocalized by interaction with the aromatic ring p-electron system.

The electrolytic reduction of nitrobenzene in a strongly acidic medium produces

1. p-Aminophenol

2. Azoxybenzene

3. Azobenzene

4. Aniline

Method by which aniline cannot be prepared is

1. hydrolysis phenyl isocyanide with an acidic solution

2. degradation of benzamide with bromine in alkaline solution

3. reduction of nitrobenzene with H₂/Pd in ethanol

4. potassium salt of phthalimide treated with chlorobenzene followed by the hydrolysis

with aqueous NaOH solution