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Q.21

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Organic Chemistry
Found in: Page 319

Short Answer

Draw the alkynes formed when each dihalide is treated with excess base.

a.

b.

c.

d.

The products formed after the treatment is shown below:

See the step by step solution

Step by Step Solution

Type of the base used

is a strong base. When used in excess, it tends to abstract all the protons since, in these substrates, two leaving groups are present. As a result, the elimination product formed gives an alkyne.

Removal of  hydrogens

Removal of excess hydrogens gives rise to the elimination product. Different types of hydrogens give different types of products. But here, different types of hydrogens give a single product due to the formation of alkyne.

Representation of beta hydrogens

Formation of alkynes

Based on the steps, the products formed after the treatment with s shown below:-

Representation of possible products in a

Representation of possible products in b

Representation of possible products in c

Representation of possible products in d

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