Assertion :Ethane is a gas while ethyl alcohol is a liquid.
Reason: Ethyl alcohol has greater molecular mass than ethane.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Ethyl alcohol is a liquid at room temperature because of formation of inter-molecular hydrogen bonds.
Ethane, however, is completely non polar. It only makes London Dispersion forces with other ethane molecules. These are not very strong. So ethane molecules can move freely, thus remaining as a gas at Room Temperature.
Also, Ethyl alcohol has greater molecular mass than ethane but that is not the correct explanation.
Hence,both assertion and reason are CORRECT, but the reason is NOT THE CORRECT explanation of the assertion.

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Similar questions

Assertion (A) Boiling points of alcohols and ethers are high.
Reason (R) They can form intermolecular hydrogen-bonding.
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Assertion :Ethane is a gas while ethyl alcohol is a liquid. Reason: Ethyl alcohol has greater molecular mass than ethane.

Assertion :Ethane is a gas while ethyl alcohol is a liquid.
Reason: Ethyl alcohol has greater molecular mass than ethane.