The number of $\mathrm{\pi }$-bonds in the formula given below, NC-CH=CH-CN are:

(1) 5

(2) 4

(3) 3

(4) 2

The product yield from the reaction of a ketone and $1°$ amine is:

1. Amides

2. Oximes

3. Urea

4. Imines

The compound formed when malonic ester reacts with urea is:

(1) cinnamic acid

(2) butyric acid

(3) barbituric acid

(4) crotonic acid

Ethylamine reacts with nitrosyl chloride (NOCl) to form:

(1) ethyl chloride

(2) ethyl alcohol

(3) ethyl nitrite

(4) nitroethane

Which compound will liberate CO₂ from NaHCO₃ solution?

(1) CH₃CONH₂

(2) CH₃NH₂

(3) (CH₃)₄N⁺OH^-

(4) CH₃N⁺H₃Cl^-

${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{NO}}_2\stackrel{\mathrm{Fe}/\mathrm{HCl}}{\to }\mathrm{A}\underset{273 \mathrm{K}}{\overset{{\mathrm{NaNO}}_2/\mathrm{HCl}}{\to }}\mathrm{B}\underset{283 \mathrm{K}}{\overset{{\mathrm{H}}_2\mathrm{O}}{\to }}\mathrm{C}$ 'C' is 

1. ${\mathrm{C}}_6{\mathrm{H}}_5-\mathrm{OH}$

2. ${\mathrm{C}}_6{\mathrm{H}}_5-{\mathrm{CH}}_2\mathrm{OH}$

3. ${\mathrm{C}}_6{\mathrm{H}}_5-\mathrm{CHO}$

4. ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{NH}}_2$

Identify the product formed from the reaction of nitrobenzene with conc. HNO₃/H₂SO₄ at 80-100°C:
1. 1,4-Dinitrobenzene 
2. 2,4,6-Trinitrobenzene
3. 1,2-Dinitrobenzene 
4. 1,3-Dinitrobenzene

Which of the following compounds is most basic here

1. diphenyl amine

2. dimethyl amine

3. guanidine

4. trimethyl amine

Whose melting point is the highest?

Carbylamine test is performed in alcoholic $KOH$ by heating a mixture of 

1. trihalogenated methane and a primary amine

2. an alkyl halide and a primary amine 

3. an alkyl cyanide and a primary amine

4. chloroform and silver powder