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When excess chlorine reacts with methane in presence of sunlight, which is the major product?

When excess chlorine reacts with methane in presence of sunlight, which is the major product? Correct Answer Carbon tetrachloride

In presence of sunlight, a free radical substitution reaction takes place between the reacting methane and chlorine molecules where in each elementary reaction a hydrogen atom is replaced by a chlorine atom in the new product. First, methane converts to 1-chloromethane which in turn produces dichloromethane followed by tri-chloromethane and tetra-chloromethane, respectively.

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