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Isomerism of amines - class-XII

Description: isomerism of amines
Number of Questions: 22
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Tags: organic compounds with functional group containing nitrogen
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The number of isomeric primary amine possible for the formula $C _3H _9N$ :

isomerism of amines organic compounds with functional group containing nitrogen

  1. 2

  2. 3

  3. 5

  4. 6

Show answer
Correct Option: A
Explanation:

The following primary amines are possible for $C _3H _9N$

(i) $CH _3-CH _2-CH _2-NH _2$    propyl amine
(ii) $CH _3-\underset {|}{CH}-CH _3$                   $2-$aminopropane   (Isopropyl amine)
                  $NH _2$
$\therefore 2$ primary amines are possible.

Amongst the following, the strongest base in aqueous medium is ____________. 

isomerism of amines organic compounds with functional group containing nitrogen

  1. $CH _3NH _2$

  2. $NCCH _2NH _2$

  3. $(CH _3) _2NH$

  4. $C _6H _5NHCH _3$

Show answer
Correct Option: C
Explanation:

${2}^{0}$ amine is strongest base in aqucous media.

order of basicly in aq. media  ${ 2 }^{ 0 }>{ 1 }^{ 0 }>{ 3 }^{ 0 }$ (amines)
in gaseous phase it is ${ 3 }^{ 0 }>{ 2 }^{ 0 }>{ 1 }^{ 0 }$ (amines)

A racemic mixture contains equal _____ of dextrorotatory and laevorotatory isomers.

isomerism of amines organic compounds with functional group containing nitrogen

  1. No. of molecules

  2. Masses

  3. No. of moles

  4. All the above are correct.

Show answer
Correct Option: D
Explanation:

A racemic mixture contains equal no. of moles or no. of molecules or masses because the only rotation is different, one is having d and another is having l.

Which of the following compounds is most basic?

isomerism of amines organic compounds with functional group containing nitrogen

  1. cyclohexylamine

  2. aniline

  3. p-methoxyaniline

  4. p-nitroaniline

Show answer
Correct Option: C
Explanation:

Basicity increases with electron releasing group. So p-methoxy aniline is having maximum basicity among give amines.

How may total structural isomers of $3^o$ amines are possible with the molecular formula $C _6H _{15}N$

isomerism of amines organic compounds with functional group containing nitrogen

  1. 4

  2. 7

  3. 6

  4. 5

Show answer
Correct Option: B

 Many amines, in the liquid state, have odors resembling that of:

isomerism of amines organic compounds with functional group containing nitrogen

  1. garlic

  2. raw fish

  3. roses

  4. skunks

Show answer
Correct Option: B
Explanation:

Many amines in liquid state have odour resem bling that of raw fish. As raw fish also have anime compounds in it. 

Which of the following is a not a primary amine?

isomerism of amines organic compounds with functional group containing nitrogen

  1. Benzedrine

  2. Methedrine

  3. Fastin

  4. None, they are all primary amines

Show answer
Correct Option: B

Which of the following statements concerning cyclic amines is correct?

isomerism of amines organic compounds with functional group containing nitrogen

  1. they can never be primary amines

  2. they are mostly aromatic compounds

  3. they can be primary or secondary amines but never tertiary amines

  4. they are only found as naturally-occurring compounds

Show answer
Correct Option: A
Explanation:

Cyclic amines can never be primary amines, as their valency is already satisfied (2 of its valency) by the carbon chain.

In production of phenyl amine, it is separated from reaction mixture by process of :

isomerism of amines organic compounds with functional group containing nitrogen

  1. steam distillation

  2. extraction

  3. sublimation

  4. evaporation

Show answer
Correct Option: A
Explanation:

Phenyl amines are prepared by steam distillation process. Amines are generally prepared by steam distillation process because of their volatility.

What is the basis for classifying amines as primary, secondary, or tertiary?

isomerism of amines organic compounds with functional group containing nitrogen

  1. The number of carbon atoms bonded directly to the nitrogen atom

  2. The number of carbon atoms bonded to a carbon bearing nitrogen

  3. The number of nitrogen atoms present

  4. The number of hydrogen atoms present

Show answer
Correct Option: A
Explanation:

Basic criteria for classifing amines as primary, secondary or tertiary is that chow much number of carbon atom bonded directly nitrogen atom.

If three carbon directly attached then ${ 3 }^{ 0 }$ amine
If two carbon directly attached then ${ 2 }^{ 0 }$ amine
If one carbon directly attached then ${ 1 }^{ 0 }$ amine

Which of the following is not a heterocyclic aliphatic amine?

isomerism of amines organic compounds with functional group containing nitrogen

  1. piperidine

  2. pyrrolidine

  3. pyrimidine

  4. They are all heterocyclic aliphatic amines

Show answer
Correct Option: C
Explanation:

Pyrimidine is a heterocyclic aromatic amine.

The common name for the compound $CH _3CH _2CH _2NH _2$ is:

isomerism of amines organic compounds with functional group containing nitrogen

  1. propylamine

  2. N-propylamine

  3. aminopropane

  4. N-aminopropane

Show answer
Correct Option: A
Explanation:

$C{ H } _{ 3 }C{ H } _{ 2 }C{ H } _{ 2 }N{ H } _{ 2 }$

As it contains three saturated carbon chain and ${ 1 }^{ 0 }$  amine. So its name is propylamine propyl for $C{ H } _{ 3 }C{ H } _{ 2 }C{ H } _{ 2 }$ group.

In the given example B,C and B,D are :

(a) $CH _3-CH _2-CH _2 - CH _2NH _2$
Butanamine $(1^o)$

(b) $CH _3-CH _2-\overset{NH _2}{\overset{|}{C}H} - CH _3$ 
Butan-2-amine $(1^o)$

(c) $CH _3-\overset{CH _3}{\overset{|}{C}H} - CH _2-NH _2$
2-Methylpropanamine $(1^o)$

(d) $CH _3-\!\!\!\!\underset{\quad CH _3}{\underset{|}{\overset{\quad CH _3}{\overset{|}{C}}}\!\!\!\!-}NH _2$
2-methylpropan-2-amine $(1^o)$

(e) $CH _3-CH _2-CH _2-NH - CH _3$
N-methylpropanamine $(2^o)$

isomerism of amines organic compounds with functional group containing nitrogen

  1. Positional isomers

  2. Chain isomers

  3. Functional isomers

  4. Metamers

Show answer
Correct Option: B
Explanation:

B,C and B,D are exbhits chain isomerism as the pairs are differed in their longest chain. Hence option B is correct.

Which of the following is the tertiary amine ?

isomerism of amines organic compounds with functional group containing nitrogen

  1. $CH _3N(CH _3) _2$

  2. $N(CH _3) _3$

  3. A,B

  4. $CH _3NH _2$

Show answer
Correct Option: C
Explanation:

$CH _3N(CH _3) _2$ and $N(CH _3) _3$ are tertiary amines tertiary amines have no hydrogen atom and three alkyl or aryl groups attached to the nitrogen. Hence option  C is correct.

Which of the following is a secondary amine ?

isomerism of amines organic compounds with functional group containing nitrogen

  1. $CH _3CH _2NH _2$

  2. $CH _3CH _2N(CH _3) _2$

  3. $CH _3CH _2NHCH _3$

  4. $CH _3CH _2H _2CNH _2$

Show answer
Correct Option: C
Explanation:

$CH _3CH _2NHCH _3$ is a secondary amine. Secondary amines have one hydrogen atom and two alkyl or aryl groups attached to the nitrogen. 

Hence option C is correct.

Which of the following is the primary amine :

isomerism of amines organic compounds with functional group containing nitrogen

  1. $CH _3NH _2$

  2. $CH _3NHCH _3$

  3. $(CH _3) _3N$

  4. None

Show answer
Correct Option: A
Explanation:

$CH _3NH _2$ is primaryamine. Primary amines  have two hydrogen atoms and one alkyl or aryl group attached to the nitrogen to form the amine or amino group $NH _2$. Hence option A is correct.

The elements present in a tertiary amine with two phenyl groups are:

isomerism of amines organic compounds with functional group containing nitrogen

  1. carbon and nitrogen

  2. carbon, nitrogen and hydrogen

  3. carbon, nitrogen and oxygen

  4. carbon, nitrogen, hydrogen and oxygen

Show answer
Correct Option: B
Explanation:
Tertiary amine has 3 carbon atoms bonded directly to the nitrogen atom
Thus the elements are carbon, nitrogen and hydrogen.

Which of the following type/(s) of isomerism is shown in  the amine of the formula $C _4H _{11}N$ :

isomerism of amines organic compounds with functional group containing nitrogen

  1. Chain isomerism

  2. Metamerism

  3. Position isomerism

  4. All of the above.

Show answer
Correct Option: D
Explanation:

The amine of the formula $C _4H _{11}N$ shows chain  isomerism, metamerism, position  isomerism as well as functional group  isomerism.

Phenyl amine is involved importantly in synthesis of:

isomerism of amines organic compounds with functional group containing nitrogen

  1. dyes

  2. medicines

  3. drugs

  4. capsules

Show answer
Correct Option: A
Explanation:

Phenyl amines are important industrially for the production of dyes.

In the given compound A,C and A,D are exbhits which of the following isomerism :

(a) $CH _3-CH _2-CH _2 - CH _2NH _2$
Butanamine $(1^o)$

(b) $CH _3-CH _2-\overset{NH _2}{\overset{|}{C}H} - CH _3$ 
Butan-2-amine $(1^o)$

(c) $CH _3-\overset{CH _3}{\overset{|}{C}H} - CH _2-NH _2$
2-Methylpropanamine $(1^o)$

(d) $CH _3-!!!!\underset{\quad CH _3}{\underset{|}{\overset{\quad CH _3}{\overset{|}{C}}}!!!!-}NH _2$
2-methylpropan-2-amine $(1^o)$

(e) $CH _3-CH _2-CH _2-NH - CH _3$
N-methylpropanamine $(2^o)$

isomerism of amines organic compounds with functional group containing nitrogen

  1. Chain isomerism

  2. position isomerism

  3. Functional isomerism

  4. Metamerism

Show answer
Correct Option: A
Explanation:

A,C and A,D are exbhits chain isomerism as the pairs are differed in their longest chain. Hence option A is correct.

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