Hydrogen atom of chloroform is definitely acidic, but that of m
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    Haloalkanes and Haloarenes

    Multiple Choice QuestionsShort Answer Type

    91. When 2-chloro-3-methyl butane is treated with alcoholic potash, 2-methyl-2-butene is the main product. Give reason.
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    92.

    Hydrogen atom of chloroform is definitely acidic, but that of methane is not. Why?

    Hydrogen atom of chloroform is acidic due to three electronegative chlorine atoms present on carbon. They latter accquires a partial positive charge due to -I effect of chlorine with the result it tends to attract electrons to the C-H bonds towards itself. Hence the removal of hydrogen atoms as proton becomes easy.
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    93.

    What is the role of phosphorus in the preparation of ethyl iodide from ethyl alcohol and iodine?

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    94.

    tetra - Butyl iodide undergoes following reactions:

    (CH3)3 Cl+H2O → (CH3)3COH + HI
    (CH3)3CI + OH– → (CH3)2 C = CH2 + H2O + I– 

    Give reasons.

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    95. p-Dichlorobenzenes have higher melting points and lower solubilities than that of their o- and m-isomers. Why?
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    96.

    RBr reacts with AgNO2 to give both RNO2 and RONO. Give reason.

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    97.

    Why a small amount of ethyl alcohol is added to chloroform stored for use as an anaes-thatic?

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    98.

    After using carbon tetrachloride as a fire extinguisher inside a closed space, the space is thoroughly ventilated. Why?

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    99.

    Unlike the chlorine atom in CH3CI, that in chlorobenzene, C6H5Cl, is not easily replaced by the —OH group. Give reason.

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    100.

    When a iodoform is heated with silver nitrate solution, a precipitate is formed. No precipitate is formed if chloroform is used in place of iodoform. Why?

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