Question

Write correct mechanism of the followings chemical reactions - a) to convert ethanol to ethene with conc H2SO4 b) 2-Bromo butane with NaOH(aq) by SN1. (2x2=4) 

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Answer 1

Explanation:

Conversion :-

1. Ethanol to Ethene
2. 2-Bromo butane with NaOH by SN1 reaction.

Solution -

1)

When Ethanol reacts with Hydrobromic acid in the presence of concentrated H2SO4 then it forms Ethyl bromide and water.

Then, Ethyl bromide reacts with alcoholic KOH to form Ethene (Elimination reaction).

Chemical equation :-

(Refer to the attachment.)

2)

When 2-bromo butane reacts with NaOH then it forms butan-2-ol and Sodium bromide. (Substitution reaction).

Chemical equation :-

(Refer to the attachment.)

Answer 2

Answer:

Ethanol is heated with an excess of concentrated sulphuric acid (act as a catalyst) at a temperature of 170C. The gases produced are passed through sodium hydroxide solution to remove the carbon dioxide and sulphur dioxide produced from side reactions.The ethene is collected over water.

CH

3

−CH

2

−OH

→

H

2

SO

4

CH

2

=CH

2

+ H

2

O