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Dehalogenation of Vicinal Dihalide

State one obs...

Question

State one observation for each of the following:
Bromine vapours are passed into a solution of ethyne in carbon tetrachloride.

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Solution

Bromine vapours are passed into a solution of ethyne in carbon tetrachlorides then the brown colour of the bromine water decolourizes.

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Q. Bromine vapours are passed into a soln. of ethyne in carbon tetrachloride gives :

Q. State what do you observe when ethene is bubbled through a solution of bromine in tetrachloromethane (carbon tetrachloride).

Q. (i) Write the equation for the laboratory preparation of ethyne (acetylene) from calcium carbide.
(ii) What is the special feature of the structure of ethyne?
(iii) What would you see when ethyne is bubbled through a solution of bromine in carbon tetrachloride?
(iv) Name the addition product formed between ethene and water.

Q. Equation for the reaction when compound

A

is bubbled through bromine dissolved in carbon tetrachloride is as follows :

A B r_{2} / C {C l}_{4} - ---------- \to \begin{matrix} C H_{2} B r | C H_{2} B r \end{matrix}

(i) Draw the structure of

A

.
(ii) State your observation during this reaction.

Reddish orange colour of the solution of bromine in carbon tetrachloride decolourises. This is a test for:

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Dehalogenation of Vicinal Dihalide

Standard XII Chemistry

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