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

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^-

Nitromethane is subjected to the treatment with chlorine in the presence of sodium hydroxide, the main product is:

(1) monochloronitromethane

(2) trichloromethane

(3) chloropicrin

(4) none of the above

Which of the following amines is optically active?

(1) ${\mathrm{CH}}_3{\mathrm{NH}}_2$

(2) ${\mathrm{CH}}_3{\mathrm{NHCH}}_3$

(3) ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2-\stackrel{\stackrel{{\mathrm{CH}}_3}{|}}{\mathrm{N}}-{\mathrm{C}}_2{\mathrm{H}}_5$

(4) Sec. butylamine

Which of the following enzymes can hydrolyse urea into CO₂ and NH₃: 

1. Amylase

2. Urease

3. Lipase

4. Zymase

Nitroparaffins on reduction give:

1. Amide

2. Alkylamine

3. Ammonium salt

4. Acetanilide

Aqueous solution of urea is:

1. Acidic

2. Alkaline

3. Almost neutral

4. Amphoteric

Primary nitroalkanes on hydrolysis give:

(1) RCOOH+NH₂OH

(2) RCOOH

(3) NH₂OH

(4) RCOR