Why is the reactivity of haloarenes low in nucleophilic substitut

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 Multiple Choice QuestionsShort Answer Type

31.

What is the function of anhydrous zinc chloride in the reaction between alcohols and hydrogen halide?

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32.

Name one reagent that is used to convert alcohols into chloroalkanes.

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33.

What is the difference in the molar masses of alkyl halides and corresponding parent haloalkanes?

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34.

Which will have higher boiling point CH3—CH2—CH2—CH2—Br or CH3—CH(CI)— CH3? Give reason.

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35.

Give reason: The order or decreasing boiling points is
CH3I > CH3Br > CH3CI > CH3F.

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 Multiple Choice QuestionsOne Word Answers

36.

Name the product formed when benzene diazonium chloride solution is warmed with aqueous KI.

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 Multiple Choice QuestionsShort Answer Type

37.

Why is the boiling point of iodo-benzene higher than chlorobenzene?

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38. State what happens when isopropyl chloride is boiled with alcoholic potassium hydroxide solution.
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39. Why is the reactivity of haloarenes low in nucleophilic substitution reactions?


In haloarenes the lone pair of electron on halogen atom is delocalized on the benzene ring. Since aryl halides are stabilizes by resonance hence the energy of acitvation for displacement of halogen form aryl halides is much greater than alkyl halides thus they not under go nucleophillic substiution reaction.

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40.

Write the Frankland's reaction shown by haloalkanes.

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