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JEE CHEMISTRY MCQ: HALOALKANES AND HALO ARENES

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Decreasing order of nucleophilicity of the given species in ethanol is

{PhO}^{-}, {I}^{-}, {EtO}^{-}, {PhS}^{-}

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Correct option: D

{PhS}^{-}>{I}^{-}>{EtO}^{-}>{PhO}^{-}

Option D is correct. In ethanol, the nucleophilicity order is PhS- > I- > EtO- > PhO- due to the effects of solvation and polarizability.

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An alkyl halide reacts with metallic sodium in dry ether. The reaction is known as : In electrophilic substitution reaction of chlorobenzene, the chloro group: Which of the followings statements is/are incorrect? Polymerization of alkenes takes place through Assertion (A): The boiling points of alkyl halides decrease in the order:

RI > {R B r} > {R C I} > {R F}

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Reason (R): The boiling points of alkyl chlorides, bromides and iodides are considerably higher than that of the hydrocarbon of comparable molecular mass. Friedel-Craft’s reaction of bromobenzene with methyl iodide gives: