Chapter 20, Problem 30A

(a)

Interpretation Introduction

Interpretation:

The name of the given alkene has to be described.

Concept Introduction:

Alkenes are acyclic or cyclic unsaturated hydrocarbons containing at least one carbon-carbon double bond (C=C) and the general molecular formula C_nH_2n (where n = number of carbon atoms). Simplest alkene among all is ethylene C₂H₄ which contains one carbon-carbon double bond.

Alkenes can also be two types-

1. Unbranched alkenes
2. Branched alkenes

Answer to Problem 30A

The name of the above compound is 2-pentene.

Explanation of Solution

  

The principle chain contains five carbon atoms and one double bond between C2 and C3. So, the name of the above compound is 2-pentene.

(b)

Interpretation Introduction

Interpretation:

The name of the given alkene has to be described.

Concept Introduction:

Alkenes are acyclic or cyclic unsaturated hydrocarbons containing at least one carbon-carbon double bond (C=C) and the general molecular formula C_nH_2n (where n = number of carbon atoms). Simplest alkene among all is ethylene C₂H₄ which contains one carbon-carbon double bond.

Alkenes can also be two types-

1. Unbranched alkenes
2. Branched alkenes

Answer to Problem 30A

The name of the above compound is 2-pentene.

Explanation of Solution

  

The principle chain contains five carbon atoms and one double bond between C2 and C3. So, the name of the above compound is 2-pentene.

(c)

Interpretation Introduction

Interpretation:

The name of the given alkene has to be described.

Concept Introduction:

Alkenes are acyclic or cyclic unsaturated hydrocarbons containing at least one carbon-carbon double bond (C=C) and the general molecular formula C_nH_2n (where n = number of carbon atoms). Simplest alkene among all is ethylene C₂H₄ which contains one carbon-carbon double bond.

Alkenes can also be two types-

1. Unbranched alkenes
2. Branched alkenes

Answer to Problem 30A

The name of the above compound is 2,5-dimethylhex-3-ene.

Explanation of Solution

  

The principle chain contains six carbon atoms, two methyl substituents at C2 and C5 and one double bond between C3 and C4. So, the name of the above compound is 2,5-dimethylhex-3-ene.

(d)

Interpretation Introduction

Interpretation:

The name of the given alkene has to be described.

Concept Introduction:

Alkenes are acyclic or cyclic unsaturated hydrocarbons containing at least one carbon-carbon double bond (C=C) and the general molecular formula C_nH_2n (where n = number of carbon atoms). Simplest alkene among all is ethylene C₂H₄ which contains one carbon-carbon double bond.

Alkenes can also be two types-

1. Unbranched alkenes
2. Branched alkenes

Answer to Problem 30A

The name of the above compound is 3,4,5-trimethylhept-1-ene.

Explanation of Solution

  

The principle chain contains seven carbon atoms, three methyl substituents at C3, C4 and C5 and one double bond between C1 and C2. So, the name of the above compound is 3,4,5-trimethylhept-1-ene.