Tag: isomerism of amines

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Questions Related to isomerism of amines

Multiple choice isomerism of amines organic compounds with functional group containing nitrogen

The number of isomeric primary amine possible for the formula $C _3H _9N$ :

  1. 2

  2. 3

  3. 5

  4. 6
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice isomerism of amines organic compounds with functional group containing nitrogen

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

  1. $CH _3NH _2$
  2. $NCCH _2NH _2$
  3. $(CH _3) _2NH$
  4. $C _6H _5NHCH _3$
Reveal answer Fill a bubble to check yourself
C Correct answer
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)

Multiple choice isomerism of amines organic compounds with functional group containing nitrogen

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

  1. No. of molecules

  2. Masses

  3. No. of moles

  4. All the above are correct.
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

Multiple choice isomerism of amines organic compounds with functional group containing nitrogen

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

  1. 4

  2. 7

  3. 6

  4. 5
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

For a tertiary (3 degree) amine with formula C6H15N, the nitrogen is bonded to three alkyl groups. The possible combinations of alkyl groups (summing to 6 carbons) are: (methyl, methyl, butyl) - 2 isomers; (methyl, ethyl, propyl) - 2 isomers; (ethyl, ethyl, ethyl) - 1 isomer; (methyl, isopropyl, ethyl) - 1 isomer; (methyl, propyl, ethyl) - 1 isomer. Total is 7.

Multiple choice isomerism of amines organic compounds with functional group containing nitrogen

Which of the following statements concerning cyclic amines is correct?

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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

Multiple choice isomerism of amines organic compounds with functional group containing nitrogen

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

  1. steam distillation

  2. extraction

  3. sublimation

  4. evaporation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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

Multiple choice isomerism of amines organic compounds with functional group containing nitrogen

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

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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