Chapter 23, Problem 39PS

(a)

Interpretation Introduction

Interpretation: For the given amines structural formula has to be drawn and also their molecular formula has to be given.

Concept introduction:

Amines are the hydrocabons which have nitrogen $\left(\text{N}\right)$ heteroatom. The nitrogen atom is substituted by alkyl groups which can be aliphatic, aromatic or cyclic. On the basis of number of alkyl groups three types of amines are possible.

(1) Primary Amines: The nitrogen atoms is substituted by one alkyl group and two hydrogen atoms are also attached to nitrogen atom is called as primary amine. For example,

(2) Secondary Amines: The nitrogen atoms is substituted by two alkyl groups and one hydrogen atom is also attached to nitrogen atom is called as secondary amine.

(3) Tertiary Amines: The nitrogen atoms is substituted by three alkyl groups and no hydrogen atom is attached to nitrogen atom is called as tertiary amine.

  

Answer to Problem 39PS

The molecular formula of the given amine is $C_2{H}_{5}N{H}_2$. The structure for the given amine is,

  

Explanation of Solution

The molecular formula of the given amine can be written by using its given name ethylamine.

The ethyl group $\left(C_2{H}_5\right)$ is substituted to the nitrogen atom and it is primary amine as no other alkyl groups are attached to nitrogen atom.

Therefore molecular formula will have on ethyl group and two hydrogen atoms attached to nitrogen atom, that is $C_2{H}_{5}N{H}_2$.

The structural formula for this amine is drawn as follows,

  

(b)

Interpretation Introduction

Interpretation: For the given amines structural formula has to be drawn and also their molecular formula has to be given.

Concept introduction:

Amines are the hydrocabons which have nitrogen $\left(\text{N}\right)$ heteroatom. The nitrogen atom is substituted by alkyl groups which can be aliphatic, aromatic or cyclic. On the basis of number of alkyl groups three types of amines are possible.

(1) Primary Amines: The nitrogen atoms is substituted by one alkyl group and two hydrogen atoms are also attached to nitrogen atom is called as primary amine. For example,

(2) Secondary Amines: The nitrogen atoms is substituted by two alkyl groups and one hydrogen atom is also attached to nitrogen atom is called as secondary amine.

(3) Tertiary Amines: The nitrogen atoms is substituted by three alkyl groups and no hydrogen atom is attached to nitrogen atom is called as tertiary amine.

  

Answer to Problem 39PS

The molecular formula of the given amine is ${\left(C_3{H}_7\right)}_{2}NH$. The structure for the given amine is,

  

Explanation of Solution

The molecular formula of the given amine can be written by using its given name dipropylamine.

The two propyl groups $\left(C_3{H}_7\right)$ are substituted to the nitrogen atom

It is secondary amine as two alkyl groups are attached to nitrogen atom.

Therefore molecular formula will have two propyl groups and one hydrogen atom attached to nitrogen atom, that is ${\left(C_3{H}_7\right)}_{2}NH$.

The structural formula for this amine is drawn as follows,

  

(c)

Interpretation Introduction

Interpretation: For the given amines structural formula has to be drawn and also their molecular formula has to be given.

Concept introduction:

Amines are the hydrocabons which have nitrogen $\left(\text{N}\right)$ heteroatom. The nitrogen atom is substituted by alkyl groups which can be aliphatic, aromatic or cyclic. On the basis of number of alkyl groups three types of amines are possible.

(1) Primary Amines: The nitrogen atoms is substituted by one alkyl group and two hydrogen atoms are also attached to nitrogen atom is called as primary amine. For example,

(2) Secondary Amines: The nitrogen atoms is substituted by two alkyl groups and one hydrogen atom is also attached to nitrogen atom is called as secondary amine.

(3) Tertiary Amines: The nitrogen atoms is substituted by three alkyl groups and no hydrogen atom is attached to nitrogen atom is called as tertiary amine.

Answer to Problem 39PS

The molecular formula of the given amine is $\left(C{H}_{3}C{H}_{2}C{H}_{2}C{H}_2\right)N{\left(C{H}_3\right)}_2$. The structure for the given amine is,

Explanation of Solution

The molecular formula of the given amine can be written by using its given name butyl dimethylamine.

The two methyl groups $\left(C{H}_3\right)$ and one butyl group $\left(C{H}_{3}C{H}_{2}C{H}_{2}C{H}_2\right)$ are substituted to the nitrogen atom

It is tertiary amine as three alkyl groups are attached to nitrogen atom.

Therefore molecular formula will have two methyl groups, one butyl group and no hydrogen atom attached to nitrogen atom, that is $\left(C{H}_{3}C{H}_{2}C{H}_{2}C{H}_2\right)N{\left(C{H}_3\right)}_2$.

The structural formula for this amine is drawn as follows,

  

(d)

Interpretation Introduction

Interpretation: For the given amines structural formula has to be drawn and also their molecular formula has to be given.

Concept introduction:

Amines are the hydrocabons which have nitrogen $\left(\text{N}\right)$ heteroatom. The nitrogen atom is substituted by alkyl groups which can be aliphatic, aromatic or cyclic. On the basis of number of alkyl groups three types of amines are possible.

(1) Primary Amines: The nitrogen atoms is substituted by one alkyl group and two hydrogen atoms are also attached to nitrogen atom is called as primary amine. For example,

(2) Secondary Amines: The nitrogen atoms is substituted by two alkyl groups and one hydrogen atom is also attached to nitrogen atom is called as secondary amine.

(3) Tertiary Amines: The nitrogen atoms is substituted by three alkyl groups and no hydrogen atom is attached to nitrogen atom is called as tertiary amine.

Answer to Problem 39PS

The molecular formula of the given amine is ${\left(C{H}_{3}C{H}_2\right)}_{3}N$. The structure for the given amine is,

Explanation of Solution

The molecular formula of the given amine can be written by using its given name triethylamine.

The three ethyl groups $\left(C{H}_{3}C{H}_2\right)$ are substituted to the nitrogen atom

It is tertiary amine as three alkyl groups are attached to nitrogen atom.

Therefore molecular formula will have three ethyl groups, no hydrogen atom attached to nitrogen atom, that is ${\left(C{H}_{3}C{H}_2\right)}_{3}N$. The structural formula for this amine is drawn as follows,