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Haloalkanes and Haloarenes

Short Answer Type

81. Gaseous hydrogen halides and not their aqueous solutions (i.e., hydrohalic acids) are used for the preparation of alkyl halides from alkenes. Why?

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82. Alkyl iodides develop coloration on long standing particularly in light. Give reason.

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83. What happens when an alkyl halide is treated with AgCN and the product is reduced?

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84.
How is acetone converted into iodoform?

Acetone is treated with iodine and sodium carbonate forming triodo acetone then the resulting compound treated with sodium hydroxide forming sodium acetate and iodoform.