ORGANIC CHEMISTRY lab multipart bonus question In the synthesis of 1-bromobutane

Question

ORGANIC CHEMISTRY lab multipart bonus question

In the synthesis of 1-bromobutane from 1-butanol lab the last three part bonus question asked:

part A) What is the reason for the 1-bromobutane to appear at the top of the round bottom during reflux and not at the bottom of the flask?

part B) What is the formation of the reddish/yellow gas that appears when sulfuric acid is added to the mixture at the beginning of the experiment?

part C) What is the purpose of extracting the organic layer with potassium carbonate?

Explanation / Answer

A) The boiling point of 1-bromo butane (102 0C) is less than 1-butanol (117 0C). Hence during reflux  1-bromobutane to appears at the top of the round bottom flask.

B) In the beginning of the experiment after addition of sulfuric acid, there is formation of HBr gas will be there.

C) Potassium carbonate will quench the excess acidic reagents present in the organic layer (like HBr and H2SO4)

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