Amines Test

Result

Amines Test - 23

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Weekly Quiz Competition

Question 1
1 / -0

What makes diazonium ion one of the best leaving group of organic chemistry?

A
Half filled electronic configuration of nitrogen atom

B
High electronegativity of nitrogen atom

C
Very high stability of dinitrogen molecule in the atmosphere

D
Weaker $$C-N$$ bond

Solution

Diazonium ion is one of best leaving group of organic chemistry because of very high stability of dinitrogen molecule in the atmosphere.
Question 2
1 / -0

Diazonium salts are used:

A
after storing for a few days after preparation

B
immediately after its preparation

C
after storing for $$2-3$$ hours

D
difficult to prepare commercially

Solution

Diazonium salts are light sensitive and break down under near UV or violet light.This is why it is used immedietly after being prepared so that it does not loses its properties.
Question 3
1 / -0

Which of the following is a true statement regarding the effect of substituent on the basic character of aromatic amines?

A
Electron donating groups like $$-OCH_3$$, $$-CH_3$$ increases the basic strength, while electron withdrawing groups like $$-NO_2$$, $$-SO_3$$, $$-COOH$$ etc. decrease the basic strength.

B
Electron donating groups like $$-OCH_3$$, $$-CH_3$$ decreases the basic strength, while electron withdrawing groups like $$-NO_2$$, $$-SO_3$$, $$-COOH$$ etc. increase the basic strength.

C
Electron donating groups like $$-OCH_3$$, $$-CN$$ increases the basic strength, while electron withdrawing groups like $$-NO_2$$, $$-SO_3$$, $$-COOH$$ etc. decrease the basic strength.

D
Electron donating groups like $$-OCH_3$$, $$-CH_3$$ increases the basic strength, while electron withdrawing groups like $$-NO_2$$, $$-SO_3$$, $$-COOH$$, $$-NH_2$$ etc. decrease the basic strength.

Solution

Electron donating groups like $$-OCH_3$$, $$-CH_3$$, $$-NH_3$$ increases the basic strength, while electron withdrawing groups like $$-NO_2$$, $$-SO_3$$, $$-COOH$$, $$-CN$$ etc. decrease the basic strength.

The electron donating groups stabilize the cation and electron withdrawing groups destabilize the cation.
Question 4
1 / -0

Which of the following is true statement?

A
Every o-substituted aniline (electron releasing or electron withdrawing) is less basic than aniline.

B
Every o-substituted aniline (electron releasing or electron withdrawing) is more basic than aniline.

C
o-substituted aniline (electron releasing) is less basic than aniline and

o-substituted aniline (electron withdrawing) is more basic than aniline.

D
o-substituted aniline (electron releasing) is more basic than aniline and

o-substituted aniline (electron withdrawing) is less basic than aniline.

Solution

Every o-substituted aniline (electron releasing or electron withdrawing) is less basic than aniline. This is due to ortho effect which is probably due to combination of steric and electronic factors.
Question 5
1 / -0

The stability of benzene diazonium salts is because of:

A
inductive effect

B
resonance

C
hyperconjugation

D
mesomeric effect

Solution

Due to resonance there is a dispersal of positive charge on the benzene ring. This resonance accounts for the stability of the diazonium ion. Hence, diazonium salts of aromatic amines are more stable than those of aliphatic amines.
Question 6
1 / -0

Which of the following amine gives diazonium salt on reaction with $$HNO_2?$$

A
$$(CH_3)_2NH$$

B
$$(CH_3)_3N$$

C
$$C_6H_5NH_2$$

D
$$CH_3NH_2$$

Solution

$$C_6H_5NH_2$$ reacts with $$HONO$$ to forms diazonium salts, the reaction are as follows
Refer tO image 01
$$NaNO_2+HCl\longrightarrow NaCl+HONO$$
Refer to Image 02
Question 7
1 / -0

Which of the following is a secondary amine ?

A
Aniline

B
Diphenyl amine

C
Sec. butyl amine

D
Tert. butyl amine

Solution

Diphenyl amine is aromatic secondary amine. N atom is attached to two aryl groups and one H atom. Aniline is aromatic primary amine.
Sec. butyl amine and tert. butyl amine are aliphatic primary amines.
Question 8
1 / -0

This compound can be classified as:

A
primary amine

B
secondary amine

C
tertiary amine

D
none of these

Solution

The $$ -{ NH }_{ 2 } $$ group in a compound makes it a primary amine.
Question 9
1 / -0

The conversion of primary aromatic amines into diazonium salts is known as:

A
diazotisation

B
displacement

C
acylation

D
alkylation

Solution

Diazonium ions are prepared by diazotization, a procedure in which a primary aromatic amine ($$ArNH_2$$) is treated with a source of nitrous acid ($$HNO_2$$). Typically this involves adding sodium nitrite ($$NaNO_2$$) to an aqueous acidic solution containing the amine.
Question 10
1 / -0

Which of the following amines yields foul smelling product with haloform and alcoholic $$KOH$$?

A
Ethylamine

B
Diethyl amine

C
Triethylamine

D
Ethyl methylamine

Solution

Primary amine react with haloform and $$alc.KOH$$ and forms carbylamine which gives foul smell.