Which of the following statements regarding alkanes is not correct?

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Bromination takes place with greater difficulty than chlorination

Chlorine has a much lesser tendency to replace tertiary hydrogen in preference to secondary or primary

More reactive reagent shows less selectivity in reaction

Chlorination of methane is retarted in the presence of oxygen

answer is B.

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Detailed Solution

Chlorine has a much lesser tendency to replace tertiary hydrogen in preference to secondary or primary, statement B regarding alkanes is not correct.

As a result of lesser differences in activation energies for attacks at the 1°, 2°, and 3° positions, chlorination is less selective than bromination. At the 1° and 2° locations, propane is halogenated. As the chain propagation processes progress, several halopropanes are formed.

Hence, option B is correct.

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