EVERYDAY SCIENCE

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SCIENCE

CHEMISTRY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which of the following statements concerning the reaction of methane with bromine under the sunlight are correct?I. It is an addition reaction.II. It is a substitution reaction.III. The end product is tetrachloromethane.IV. A similar reaction will occur if propane is used instead of methane.
A
I and IV only
B
II and III only
C
I, III and IV only
D
II, III and IV only
Explanation: 

Detailed explanation-1: -When a mixture of methane and bromine is exposed to ultraviolet light-typically sunlight-a substitution reaction occurs and the organic product is bromomethane. However, the reaction doesn’t stop there, and all the hydrogens in the methane can in turn be replaced by bromine atoms.

Detailed explanation-2: -Bromination of methane proceeds via a radical chain mechanism which involves radical intermediates. The mechanism consists of three key steps i.e. Initiation, propagation and termination. It results in the formation of methyl bromide and hydrogen bromide.

Detailed explanation-3: -First the bromine radical reacts with cyclohexane to form cyclohexyl radical and hydrogen bromide as products. Then, cyclohexyl radical reacts with bromine (Br₂) to form bromocyclohexane and bromine radical (Bṙ·).

Detailed explanation-4: -Methane is reacted with chlorine in the presence of sunlight to produce chloromethane.

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