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Highly selective Backlog Qs for JEE MainChemistryChemical Bonding and Molecular Structure

Assertion : CH ₃ OCH ₃ and C ₂ H ₅ OH has comparable molecular weight but boiling point of C ₂ H ₅ OH is more than dimethyl ether. Reason : C ₂ H ₅ OH forms intermolecular Hbonding while CH ₃ OCH ₃ forms intramolecular H -bonding.

Options

  1. AIf both Assertion and Reason are true and Reason is the correct explanation of Assertion.
  2. BIf both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  3. CIf Assertion is true but Reason is false.
  4. DIf Assertion is false but Reason is true.

Correct answer

C. If Assertion is true but Reason is false.

Step-by-step solution

Due to the presence of hydroxyl group (- OH ) , there is extensive hydrogen bonding between the ethanol molecules ( C ₂ H ₅ OH ) . But there is no such hydrogen bonding in dimethyl ether (due to absence of -OH group). So boiling point of dimethyl ether is much lower than ethanol.

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