Question

Which of the following is incorrect with regard to the reaction between C2H4 and Cl2 in CCl4?

(a) It results in the formation of a vicinal dihalide

(b) It results in the breaking of the C-C double bond

(c) It results in the formation of a colourless compound

(d) It results in the discharge of a reddish-brown colour

The question was asked in a job interview.

Question is from Methods of Preparation of Haloalkanes in chapter Haloalkanes and Haloarenes of Chemistry – Class 12

Answer 1

The correct option is (d) It results in the discharge of a reddish-brown colour

To elaborate: The reddish-brown colour is discharged when Br2 reacts with an alkene to form a vic-dihalide. This makes it an important test for the detection of a double bond.