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Which purification technique is used for high boiling organic liquid compound (decomposes near its boiling point) ?

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Important Questions on Organic Chemistry- Some Basic Principles and Techniques

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The number of acyclic structural isomers (including geometrical isomers) for pentene are       
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In Carius method, halogen containing organic compound is heated with fuming nitric acid in the presence of:
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The metal that can be purified economically by fractional distillation method is:
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 Arrange the following labelled hydrogens in decreasing order of acidity: 

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In Carius method of estimation of halogen, 0.172 g of an organic compound showed presence of 0.08 g of bromine. Which of these is the correct structure of the compound ?