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Question

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

A
Assertion and Reason are correct and Reason is the correct explanation of Assertion
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B
Both the Assertion and Reason are correct and Reason is not the correct explanation of Assertion
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C
Assertion is correct but Reason is not correct
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D
Assertion is not correct but Reason is correct
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E
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 CH3Cl.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. CH3Cl is an example.

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