Chapter 12, Problem 6P

Interpretation Introduction

(a)

Interpretation:

To name and draw structural formula for alkenes with the molecular formula ${\text{C}}_6\text{H}$ that has the given skeleton-

Concept Introduction:

Isomers are the compounds that have same molecular formula but different structural formula.

Cis-trans isomerism arises in the compounds when there is a difference in the orientation of the two same groups.

When two same groups are along the same side of the C-C bond it is called as cis isomer, but when the same groups lie opposite to each other along the C-C bond. It is said to be trans isomer.

Example- Cis-1,2-dibromo ethane and trans-1,2, dibromo ethane are cis-trans isomers.

Answer to Problem 6P

The alkenes with the molecular formula ${\text{C}}_6\text{H}$ and given skeleton are as follows:

1. 
2. 
3. 
4. 

Explanation of Solution

The longest chain for the given skeleton has 5 carbons therefore the root name prop- is used here. The alkenes with the molecular formula ${\text{C}}_6\text{H}$ that has the given skeleton are as follows:

1. 

In this isomer, it contains 6 carbons and 12 hydrogen atoms, thus the molecular formula is ${\text{C}}_6\text{H}$ and the double bond is placed at carbon 1. one substituent is also attached at carbon 2, the substituent is methyl. So, the compound will be named as- 2-methyl-Pent-1-ene.

2. 

In this isomer, it contains 6 carbons and 12 hydrogen atoms, thus the molecular formula is ${\text{C}}_6\text{H}$ and the double bond is placed at carbon 2. one substituent is also attached at carbon 2, the substituent is methyl. So, the compound will be named as- 2-methyl-Pent-2-ene.

3. 

In this isomer, it contains 6 carbons and 12 hydrogen atoms, thus the molecular formula is ${\text{C}}_6\text{H}$ and the double bond is placed at carbon 2. one substituent is also attached at carbon 4, the substituent is methyl. So, the compound will be named as- 4-methyl-Pent-2-ene.

4. 

In this isomer, it contains 6 carbons and 12 hydrogen atoms, thus the molecular formula is ${\text{C}}_6\text{H}$ and the double bond is placed at carbon 1. one substituent is also attached at carbon 4, the substituent is methyl. So, the compound will be named as- 4-methyl-Pent-1-ene

Interpretation Introduction

(b)

Interpretation:

To name and draw structural formula for alkenes with the molecular formula ${\text{C}}_6\text{H}$ that has the given skeleton-

Concept Introduction:

Isomers are the compounds that have same molecular formula but different structural formula.

Cis-trans isomerism arises in the compounds when there is a difference in the orientation of the two same groups.

When two same groups are along the same side of the C-C bond it is called as cis isomer, but when the same groups lie opposite to each other along the C-C bond. It is said to be trans isomer.

Example- Cis-1,2-dibromo ethane and trans-1,2, dibromo ethane are cis-trans isomers.

Answer to Problem 6P

The alkenes with the molecular formula ${\text{C}}_6\text{H}$ that has the given skeleton are as follows:

1. 
2. 

Explanation of Solution

The longest chain for the given skeleton has 4 carbons therefore the root name but- is used here. The alkenes with the molecular formula ${\text{C}}_6\text{H}$ that has the given skeleton are as follows:

1. 

In this isomer, it contains 6 carbons and 12 hydrogen atoms, thus the molecular formula is ${\text{C}}_6\text{H}$ and the double bond is placed at carbon 1. one substituent is also attached at carbon 2 and3 each, the substituent is methyl. So, the compound will be named as- 2,3-dimethyl-But-1-ene.

2. 

In this isomer, it contains 6 carbons and 12 hydrogen atoms, thus the molecular formula is ${\text{C}}_6\text{H}$ and the double bond is placed at carbon 2. one substituent is also attached at carbon 2 and3 each, the substituent is methyl. So, the compound will be named as- 2,3-dimethyl-But-2-ene

Interpretation Introduction

(c)

Interpretation:

To name and draw structural formula for alkenes with the molecular formula ${\text{C}}_6\text{H}$ that has the given skeleton-

Concept Introduction:

Isomers are the compounds that have same molecular formula but different structural formula.

Cis-trans isomerism arises in the compounds when there is a difference in the orientation of the two same groups.

When two same groups are along the same side of the C-C bond it is called as cis isomer, but when the same groups lie opposite to each other along the C-C bond. It is said to be trans isomer.

Example- Cis-1,2-dibromo ethane and trans-1,2, dibromo ethane are cis-trans isomers.

Answer to Problem 6P

The alkene with the molecular formula ${\text{C}}_6\text{H}$ that has the given skeleton is as follows:

Explanation of Solution

The longest chain for the given skeleton has 4 carbons therefore the root name but- is used here. The alkene with the molecular formula ${\text{C}}_6\text{H}$ that has the given skeleton is as follows:

In this isomer, it contains 6 carbons and 12 hydrogen atoms, thus the molecular formula is ${\text{C}}_6\text{H}$ and the double bond is placed at carbon 3. Two substituents are also attached at carbon 2, the substituent is methyl. So, the compound will be named as- 2,2-dimethyl-But-3-ene.

Interpretation Introduction

(c)

Interpretation:

To name and draw structural formula for alkenes with the molecular formula ${\text{C}}_6\text{H}$ that has the given skeleton-

Concept Introduction:

Isomers are the compounds that have same molecular formula but different structural formula.

Cis-trans isomerism arises in the compounds when there is a difference in the orientation of the two same groups.

When two same groups are along the same side of the C-C bond it is called as cis isomer, but when the same groups lie opposite to each other along the C-C bond. It is said to be trans isomer.

Example- Cis-1,2-dibromo ethane and trans-1,2, dibromo ethane are cis-trans isomers.

Answer to Problem 6P

The alkene with the molecular formula ${\text{C}}_6\text{H}$ that has the given skeleton is as follows:

Explanation of Solution

The longest chain for the given skeleton has 4 carbons therefore the root name but- is used here. The alkene with the molecular formula ${\text{C}}_6\text{H}$ that has the given skeleton is as follows:

In this isomer, it contains 6 carbons and 12 hydrogen atoms, thus the molecular formula is ${\text{C}}_6\text{H}$ and the double bond is placed at carbon 3. Two substituents are also attached at carbon 2, the substituent is methyl. So, the compound will be named as- 2,2-dimethyl-But-3-ene.