Tag: isomerism of amines

Questions Related to isomerism of amines

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

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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.

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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

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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

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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

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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

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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

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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

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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