Chapter 11, Problem 11A.11E

(a)

Interpretation Introduction

Interpretation:

The condensed formula of $\text{3-methylpent-1-ene}$ has to be given.

Concept Introduction:

Condensed structural formula:  Condensed structural formula shows the arrangement of atoms in grouped form.

Answer to Problem 11A.11E

The condensed formula of $\text{3-methylpent-1-ene}$ is ${\text{CH}}_{\text{2}}{\left(\text{CH}\right)}_{\text{2}}\left({\text{CH}}_{\text{3}}\right){\text{CH}}_{\text{2}}{\text{CH}}_{\text{3}}\text{.}$

Explanation of Solution

The given compound is,

The parent chain of the compound is pentane.  One methyl group is present in the carbon third position and a double bond is found in carbon first position.  Hence, the systematic name of the compound is $\text{3-methylpent-1-ene}$ and its condensed formula is ${\text{CH}}_{\text{2}}{\left(\text{CH}\right)}_{\text{2}}\left({\text{CH}}_{\text{3}}\right){\text{CH}}_{\text{2}}{\text{CH}}_{\text{3}}\text{.}$

(b)

Interpretation Introduction

Interpretation:

The condensed formula of $\text{4-ethyl-3,3-dimethylheptane}$ has to be given.

Concept Introduction:

Refer to part (a).

Answer to Problem 11A.11E

The condensed formula of $\text{4-ethyl-3,3-dimethylheptane}$ is ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}\text{C}{\left({\text{CH}}_{\text{3}}\right)}_{\text{2}}\text{CH}\left({\text{CH}}_{\text{2}}{\text{CH}}_{\text{3}}\right){\left({\text{CH}}_{\text{2}}\right)}_{\text{2}}{\text{CH}}_{\text{3}}\text{.}$

Explanation of Solution

The given compound is,

The parent chain of the compound is heptane.  One ethyl group is present in the carbon fourth position and two methyl groups are present in carbon third position.  Hence, the systematic name of the compound is $\text{4-ethyl-3,3-dimethylheptane}$ and its condensed formula is ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}\text{C}{\left({\text{CH}}_{\text{3}}\right)}_{\text{2}}\text{CH}\left({\text{CH}}_{\text{2}}{\text{CH}}_{\text{3}}\right){\left({\text{CH}}_{\text{2}}\right)}_{\text{2}}{\text{CH}}_{\text{3}}\text{.}$

(c)

Interpretation Introduction

Interpretation:

The condensed formula of $\text{5,5-dimethyl-1-hexyne}$ has to be given.

Concept Introduction:

Refer to part (a).

Answer to Problem 11A.11E

The condensed formula of $\text{5,5-dimethyl-1-hexyne}$ is $\text{CHC}{\left({\text{CH}}_{\text{2}}\right)}_{\text{2}}\text{C}{\left({\text{CH}}_{\text{3}}\right)}_{\text{3}}\text{.}$

Explanation of Solution

The given compound is,

The parent chain of the compound is hexane.  Two methyl groups are present in carbon fifth position and a triple bond is seen at the carbon first position.  Hence, the systematic name of the compound is $\text{5,5-dimethyl-1-hexyne}$ and its condensed formula is $\text{CHC}{\left({\text{CH}}_{\text{2}}\right)}_{\text{2}}\text{C}{\left({\text{CH}}_{\text{3}}\right)}_{\text{3}}\text{.}$

(d)

Interpretation Introduction

Interpretation:

The condensed formula of $\text{3-ethyl-2,4-dimethylpentane}$ has to be given.

Concept Introduction:

Refer to part (a).

Answer to Problem 11A.11E

The condensed formula of $\text{3-ethyl-2,4-dimethylpentane}$ is ${\text{CH}}_{\text{3}}\text{CH}\left({\text{CH}}_{\text{3}}\right)\text{CH}\left({\text{CH}}_{\text{2}}{\text{CH}}_{\text{3}}\right)\text{CH}{\left({\text{CH}}_{\text{3}}\right)}_{\text{2}}\text{.}$

Explanation of Solution

The given compound is,

The parent chain of the compound is pentane.  One ethyl group is present in the carbon third position and two methyl groups are present in carbon second and fourth position respectively.

Hence, the systematic name of the compound is $\text{3-ethyl-2,4-dimethylpentane}$ and its condensed formula is ${\text{CH}}_{\text{3}}\text{CH}\left({\text{CH}}_{\text{3}}\right)\text{CH}\left({\text{CH}}_{\text{2}}{\text{CH}}_{\text{3}}\right)\text{CH}{\left({\text{CH}}_{\text{3}}\right)}_{\text{2}}\text{.}$