Suggest a sequence of reactions suitable for preparing following compound from the indicated starting material. You may use any necessary organic or inorganic reagents.
Trans−1,2−dichlorocyclopentane from cyclopentane.
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Solution
Free radical chlorination of cyclopentane in presence of light gives cyclopentyl chloride. Dehydrochlorination with alcoholic KOH gives cyclopentene. Chlorination with chlorine in presence of carbon tetrachloride gives trans 1,2-dichlorocyclopentane.