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Haloalkanes and Haloarenes Conceptual Questions

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Question : Explain why neopentyl chloride cannot be prepared by the action of HCl on neopentyl alcohol.
Question : Explain why thionyl chloride method is preferred over hydrogen chloride or phosphorus pentachloride method for the preparation of chloroalkanes.
Question : Why does fluorination of hydrocarbons with pure F2 gas occur explosively?
Question : Iodination of methane is reversible. Explain why.
Question : Direct iodination of aromatic hydrocarbons is not useful. why?
Question : Why do alkyl iodides on standing become violet or brown?
Question : Haloarenes are insoluble in water but soluble in benzene. Explain.
Question : p-Dichlorobenzene has higher melting point and lower solubility than those of o- and m-isomers. Explain.
Question : Alkyl halides give alkyl cyanides with KCN but alkyl isocyanides with AgCN. Explain.
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