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How is chlorination done in manufacture of BHC?

(a) By Infrared rays

(b) By UV light

(c) By sulphur as catalyst

(d) Adding NaOH

I had been asked this question in an international level competition.

The query is from Synthetic Organic Chemical topic in portion Synthetic Organic Chemical Industries of Chemical Technology

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Correct option is (b) By UV light

To elaborate: The crux of the process involves the use of a source of free radicals such as ultraviolet light to produce an addition chlorination reaction.

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