Assertion : $C H_{3} C l$ is a polar molecule.
Reason : The Lewis diagram of polar molecules always has at least one lone pair of electrons.

Assertion and Reason are correct and Reason is the correct explanation of Assertion

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Both the Assertion and Reason are correct and Reason is not the correct explanation of Assertion

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Assertion is correct but Reason is not correct

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Assertion is not correct but Reason is correct

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Both the Assertion and Reason are not correct

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Solution

The correct option is C Assertion is correct but Reason is not correct
Compound in statement 1 must be $C H_{3} C l$ .Since carbon,hydrogen and chlorine have different electronegativity,the bonds are polar in nature. Moreover, there is symmetry in the structure of the molecule, so there is a net dipole moment hence it is a polar molecule.
It is not a necessary condition that there has to at least one lone pair of electrons for a molecule to be polar. $C H_{3} C l$ is an example.

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Assertion : CH3Cl is a polar molecule.Reason : The Lewis diagram of polar molecules always has at least one lone pair of electrons.

Assertion : $C H_{3} C l$ is a polar molecule.
Reason : The Lewis diagram of polar molecules always has at least one lone pair of electrons.