Amines Test

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Amines Test - 10

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Weekly Quiz Competition

Question 1
1 / -0

In the given replacement reaction, the reaction will be most favourable if $$M$$ happens to be:

A
$$K$$

B
$$Rb$$

C
$$Li$$

D
$$Na$$

Solution

Reaction is faster with $$Rb$$ because lattice of $$RbF$$ is less than $$LiF, NaF, KF$$e energy
Question 2
1 / -0

Which of the following reagents would not be a good choice for reducing an aryl nitro compound to an amine?

A
$${H}_{2}(excess)/Pt$$

B
$$LiAl{H}_{4}$$ in ether

C
$$Fe$$ and $$HCl$$

D
$$Sn$$ and $$HCl$$

Solution

$$LiAl{ H }_{ 4 }/ether$$ reduces aryl nitro compounds to azo compounds
$$2{C}_{6}{H}_{5}{NO}_{2} \xrightarrow [ ]{ LiAl{ H }_{ 4 } } {C}_{6}{H}_{5}N=N-{C}_{6}{H}_{5}$$
nitrobenzene azobenzene
Question 3
1 / -0

The correct decreasing order of $$pK_{b}$$ is:

A
$$I > II > III > IV$$

B
$$III > IV > III > I$$

C
$$II > III > IV > I$$

D
$$IV > II > I > III$$

Solution

Substituent with strong $$+R$$ effect, $$+I$$ effect and weaker $$-I$$ effect increases the basicity.

Hence $$pK_{b}$$ decreases.

Also, alkylamines are stronger bases than arylamines.

So, the order is option D.
Question 4
1 / -0

Amines are the derivatives of:

A
acids

B
ammonia

C
alkanes

D
esters

Solution

Amines are derivative of ammonia, wherein one or more hydrogen atoms have been replaced by a substituent such as an alkyl or aryl group (these may respectively be called alkylamines and arylamines; in which both types of substituent are attached to one nitrogen atom may be called alkylarylamines).
Question 5
1 / -0

Which amino acid in present only in bacteria and cyanobacteria ?

A
Glycine

B
Tyrosine

C
Glutamic acid

D
Diaminopimellic acid

Solution

1. Amino acid present only in bacteria and cyanobacteria is diaminopimellic acid.
2. The amino acid only in bacteria and blue algea are methaionine, diaminopimellic, aspartic acid, glutamic acid.
Question 6
1 / -0

Which of the following is secondary amine?

A
$${ CH_3-NH }_{ 2 }$$

B
$$CH_3-N-(C_2H_5)_2$$

C
$$CH_3-NHCH_3$$

D
$$CH_3-N(CH_3)_2$$

Solution

In secondary amine, 2 alkyl groups and one hydrogen atom are directly attached to N atom.

It is represented by general formula $$R_2NH$$.

$$CH_3-NHCH_3$$ represents $$R-NH-R$$.

Hence, option C is correct.
Question 7
1 / -0

Which of the following is more appropriate reason for aniline being less basic than aliphatic amines?

A
Inductive effect

B
Steric hindrance

C
Positive mesomeric effect

D
Negative mesomeric effect

Solution

$$NH_{2}$$ gives e- away from the group.
So e- density of N decrease and hence less available for Protonation.
So less Basicity.
In aliphatic amines, no mesomerism (resonance) takes place. Thus it has more electrons available for donation thus shows more basic property.
Question 8
1 / -0

The first organic compound synthesized in the laboratory from an inorganic compound is:

A
$$NH_{4}NCO$$

B
$$NH_{2}-CO-NH_{2}$$

C
$$CH_{3}COOH$$

D
$$CH_{4}$$

Solution

The first organic compound synthesized in the laboratory from an inorganic compound is urea which is $$NH_2CONH_2$$.
Question 9
1 / -0

A mixture containing primary, secondary and tertiary amine is treated with diethyl oxalate. Choose the correct statement:

A

The distillate of the mixture after treatment mainly contains $$1^o$$ amines.

B
Tertiary amine do not react with diethyl oxalate

C
This is Hinsberg method of separating $$1^o ,2^o$$ and $$3^o$$ amines.

D
$$3^∘$$ amine is removed by filtration
Question 10
1 / -0

Which of the following effects of $$-NO_{2}$$ group operates on $$-NH_{2}$$ group in this molecule?

A
Only $$+M$$ effect

B
Only $$-M$$ effect

C
Both $$-l$$ and $$-M$$ effect

D
Only $$-l$$ effect

Solution

Due to steric hindrance, the given species only show $$-I$$ effect of $$-NO_{2}$$ on $$-NH_{2}$$.

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Amines Test - 10

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Amines Test - 10

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Question 1

$$K$$

$$Rb$$

$$Li$$

$$Na$$

Solution

Question 2

$${H}_{2}(excess)/Pt$$

$$LiAl{H}_{4}$$ in ether

$$Fe$$ and $$HCl$$

$$Sn$$ and $$HCl$$

Solution

Question 3

$$I > II > III > IV$$

$$III > IV > III > I$$

$$II > III > IV > I$$

$$IV > II > I > III$$

Solution

Question 4

acids

ammonia

alkanes

esters

Solution

Question 5

Glycine

Tyrosine

Glutamic acid

Diaminopimellic acid

Solution

Question 6

$${ CH_3-NH }_{ 2 }$$

$$CH_3-N-(C_2H_5)_2$$

$$CH_3-NHCH_3$$

$$CH_3-N(CH_3)_2$$

Solution

Question 7

Inductive effect

Steric hindrance

Positive mesomeric effect

Negative mesomeric effect

Solution

Question 8

$$NH_{4}NCO$$

$$NH_{2}-CO-NH_{2}$$

$$CH_{3}COOH$$

$$CH_{4}$$

Solution

Question 9

The distillate of the mixture after treatment mainly contains $$1^o$$ amines.

Tertiary amine do not react with diethyl oxalate

This is Hinsberg method of separating $$1^o ,2^o$$ and $$3^o$$ amines.

$$3^∘$$ amine is removed by filtration

Question 10

Only $$+M$$ effect

Only $$-M$$ effect

Both $$-l$$ and $$-M$$ effect

Only $$-l$$ effect

Solution

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