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Consider the isomers of hydrocarbon with molecular formula C₅H₁₀ . These isomers do not decolourise KMnO₄ solution. These isomers are subjected to chlorination with chlorine in presence of light to give monochloro compounds. The total number of monochloro compounds (structural isomers only) formed is _______.

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The hydrocarbon with molecular formula C₅H₁₀ has a degree of unsaturation of 1 . Since its isomers do not decolourise KMnO₄ solution, they do not contain any carbon-carbon double bonds. Thus, they must be cycloalkanes. The possible structural isomers of cyclic C₅H₁₀ and the number of their monochloro structural isomers are as follows: 1. Cyclopentane: All carbon atoms are equivalent. Chlorination gives 1 monochloro product (chlorocyclopentane). 2. Methylcyclobutane: There are 4 different types of hydrogen atoms (on

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