Chapter 11, Problem 11A.12E

(a)

Interpretation Introduction

Interpretation:

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

Concept Introduction:

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

Answer to Problem 11A.12E

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

Explanation of Solution

The given compound is,

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

(b)

Interpretation Introduction

Interpretation:

The condensed formula of $\text{3-ethyl-4-methyl-1-pentene}$ has to be given.

Concept Introduction:

Refer to part (a).

Answer to Problem 11A.12E

The condensed formula of $\text{3-ethyl-4-methyl-1-pentene}$ is ${\text{CH}}_{\text{2}}{\left(\text{CH}\right)}_{\text{2}}\left({\text{CH}}_{\text{2}}{\text{CH}}_{\text{3}}\right)\text{CH}{\left({\text{CH}}_{\text{3}}\right)}_{\text{2}}\text{.}$

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 one methyl group is present in carbon fourth position.  One double bond is present at the carbon first position.

Hence, the systematic name of the compound is $\text{3-ethyl-4-methyl-1-pentene}$ and its condensed formula is ${\text{CH}}_{\text{2}}{\left(\text{CH}\right)}_{\text{2}}\left({\text{CH}}_{\text{2}}{\text{CH}}_{\text{3}}\right)\text{CH}{\left({\text{CH}}_{\text{3}}\right)}_{\text{2}}\text{.}$

(c)

Interpretation Introduction

Interpretation:

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

Concept Introduction:

Refer to part (a).

Answer to Problem 11A.12E

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

Explanation of Solution

The given compound is,

The parent chain of the compound is heptane.  One methyl group is present in carbon fourth position and a double bond is seen at the carbon third position.  Hence, the systematic name of the compound is $\text{cis-4-ethyl-3-heptene}$ and its condensed formula is ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}\text{CHC}\left({\text{CH}}_{\text{2}}{\text{CH}}_{\text{3}}\right){\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{3}}\text{.}$

(d)

Interpretation Introduction

Interpretation:

The condensed formula of $\text{trans-4-methyl-2-hexene}$ has to be given.

Concept Introduction:

Refer to part (a).

Answer to Problem 11A.12E

The condensed formula of $\text{trans-4-methyl-2-hexene}$ is ${\text{CH}}_{\text{3}}{\left(\text{CH}\right)}_{\text{3}}\left({\text{CH}}_{\text{3}}\right){\text{CH}}_{\text{2}}{\text{CH}}_{\text{3}}\text{.}$

Explanation of Solution

The given compound is,

The parent chain of the compound is hexane.  One methyl group is present in the carbon fourth position and a double bond is present in carbon second position.

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