Page 42 - 6641

B r B r
C H C H + B r 2 C H C H

B r B r
B r B r
1,2.3.4-tetrabromoethane

Then, the gas-fired tube is immersed in a test tube
3
containing 2-3 cm of 0.5% potassium permanganate
solution and pass ethin through it. In this case, the violet
color of the solution disappears and a brown precipitate
forms, indicating the oxidation of ethin, which occurs by the
equation of reaction:

O

C
O K
3 C H C H + 8 K M nO 3 O + 8 M nO + K O H + H O2 2
4 C 2 2
O K brown siege
brown siege

Since ethyne has a high percentage of Carbon content,
in the absence of oxygen, ethyn burns to a boiling flame,
which can be observed by burning ethyne at the opening of
the gas-duct tube. (Attention! A mixture of ethin and air is
explosive!)
The combustion of ethinium in a sufficient amount of
oxygen is described by the equation of reaction

2HC2HC СН + 5О 2 → 4СО 2 ↑ + 2Н 2О
2HC ≡ СН + 5О 2 → 4СО 2 ↑ + 2Н 2О

The ratio of benzene to a potassium permanganate
aqueous solution

3
3
Pour 2-3 cm of benzene into a test tube and add 2 cm
of a 0.5% solution of potassium permanganate acidified