Chapter 20, Problem 64A

(a)

Interpretation Introduction

Interpretation:

The structural formula and product for the given reaction should be predicted.

  

Concept Introduction:

The representation of arrangement of atoms, group of atoms and bonds (double or triple) in the compound is called as structural formula.

Answer to Problem 64A

The structural formula and product for the given reaction is represented as follows:

  

Explanation of Solution

The reaction of alkane with any halogen in the presence of light form haloalkane. This type of reaction is termed as halogenation reaction. As free radicals are formed as reactive intermediate thus, this is also known as free radical halogenation reaction.

The first step is initiation which involves homolytic cleavage of bond of given molecule giving rise to free radicals on given atom or molecule, second step is propagation in which radicals produced in the first step reacts with given reactant to form a product with a radical on it and attachment of one free radical atom produced in first step. And the third step is termination in which two similar or dissimilar radicals form bonds with each other to form different product.

Thus, the reaction of ethane with chlorine in the presence of light will produce chloroethane along with HCl as a side product.

  

(b)

Interpretation Introduction

Interpretation:

The structural formula and product for the given reaction should be predicted.

  

Concept Introduction:

The representation of arrangement of atoms, group of atoms and bonds (double or triple) in the compound is called as structural formula.

Answer to Problem 64A

The structural formula and product for the given reaction is represented as follows:

  

Explanation of Solution

The reaction of an alkene with hydrogen in the presence of platinum, palladium, and nickel leads to the formation of an alkane. This type of reaction is termed as reduction process.

Thus, but-2-ene on reaction with hydrogen in the presence of platinum leads to the formation of butane. The reaction for the same is represented as follows:

  

(c)

Interpretation Introduction

Interpretation:

The structural formula and product for the given reaction should be predicted.

  

Concept Introduction:

The representation of arrangement of atoms, group of atoms and bonds (double or triple) in the compound is called as structural formula.

Answer to Problem 64A

The structural formula and product for the given reaction is represented as follows:

  

Explanation of Solution

Alkenes undergoes addition reaction due to the pie electron density above and below the plane. Thus, the reaction of given alkene with Br₂ gives an addition product and forms 2,3-dibromo-3-ethylpentane. Thus, the chemical reaction for the same is represented as follows: