Question

How is e thyne prepared e tetra holide​

Answer 1

Answer:

Preparation of Alkynes

Methods of prepration of alkynes

concept

1. From calcium carbide: Calcium carbide react with water to give acetylene.Impurities of phosphine and hydrogen sulphide are removed by passing acetylene through copper sulphate solution.

2. From vicinal dihalide: The dihalides in which two halogen atoms are attached to adjacent carbon atoms are called vicinal or alkylene dihalides.

3. From tetrahalides : When acetylene tetra bromide is heated with zinc in presence of alcohol, acetylene is formed

Answer 2

Explanation:

Solution

(a) Preparation of carbon tetrachloride from methane:

C

H

4

+

C

l

2

600

K

−−−−−−−−−→

Difused sunlight

C

H

3

C

l

+

H

C

l

C

H

3

C

l

+

C

l

2

⟶

C

H

2

C

l

2

+

H

C

l

C

H

2

C

l

2

+

C

l

2

⟶

C

H

C

l

3

+

H

C

l

C

H

C

l

3

+

C

l

2

⟶

C

C

l

4

+

H

C

l

(b) The structural formula of ethyne:

H

−

C

≡

C

−

H

(c) Alkynes contain triple bond whereas alkenes contain a double bond.