Which of the following molecules contains one lone pair of electrons on the central atom?

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${CCl}_{4}$

$H_{2} S$

${CH}_{4}$

${PH}_{3}$

answer is B.

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Detailed Solution

In ${PH}_{3}$ molecule, the central atom 'P' contains one lone pair. In ${CH}_{4}$ and ${CHCl}_{3}$ the central atom C does not have any extra electrons as the covalency of carbon is satisfied.

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