Q.34 - Organic Chemistry

Question

For each of the following alkenes, draw the structure of two different alkyl halides that yield the given alkene as the only product of dehydrohalogenation.

a.

b.

c.

Step-by-Step Solution

Answer

The alkyl halides from where the elimination products are obtained are shown below:

Possibilities of β hydrogens

The $\mathbf{\text{β}}$  hydrogens in the structure should be found in such a way that even though the  $\mathbf{\text{β}}$ hydrogen are of different types, they still give the same elimination product.

Representation of different types of beta hydrogens

Removal of β hydrogens to form the elimination product

When a strong base is added to the reaction, the base abstracts protons from the  $\text{β}$ carbon, and the elimination products are obtained.

The elimination products are obtained from the alkyl halides, as shown below:

Representation of all the possible alkyl halides for a

Representation of all the possible alkyl halides for b

Representation of all the possible alkyl halides for c