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How is chloral condensed in the manufacture of DDT?

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How is chloral condensed in the manufacture of DDT?

(a) Adding Sulfuric acid

(b) Adding hydrochloric acid

(c) Adding NaOH

(d) Adding phosphoric acid
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Right choice is (a) Adding Sulfuric acid

For explanation: The chloral or chlorobenzene are condensed using strong sulfuric acid or oleum as catalyst. The reaction takes place at 15°C and reaction time of 5-6 hours.
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