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solutions were shaken and after separation of aqueous and
organic phase the resultswere observed. In test tubes, which
contained hexane, no changes occurred. In a test tube, which
contained 1-hexene, purple color of the KMnO 4 solution
changed to brown due to the reduction reaction of KMnO 4
to MnO 2, and accordingly, oxidation alkene.
In a test tube with 1-hex and bromine water can be
seen a very rapid discoloration of bromine water due to the
reaction:

Н 2С=СН-СН 2-СН 2-СН 2-СН 3+Br 2→

Н 2С-СН-СН 2-СН 2-СН 2-СН 3

Br Br

Getting ethene and studying its properties

3
In a test tube with a gas-duct (Fig. 2.1) pour 5-6 cm of pre-
prepared mixture consisting of one part of ethanol and three
parts of concentrated sulfuric acid (in volume), introduce
thin glass capillaries to prevent emissions of substances
from the test tube. The tube is covered with a gas-fired tube
and carefully heated. After displacement from the air
sample tube, the formed ethane is passed into a test tube
with bromine water, and then - in aqueous solution of
potassium permanganate.