AIIMS 2001
- Exam
- AIIMS
- Year
- 2001
- Subject
- Chemistry
- Chapter
- Chemical Bonding and Molecular Structure
AIIMS 2001 · Chemistry · Chemical Bonding and Molecular Structure
Assertion : CH_3 OCH_3 and C_2 H_5 OH has comparable molecular...
Assertion : and has comparable molecular weight but boiling point of is more than dimethyl ether.
Reason : forms intermolecular Hbonding while forms intramolecular -bonding.
Options
- AIf both Assertion and Reason are true and Reason is the correct explanation of Assertion.
- BIf both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
- CIf Assertion is true but Reason is false.
- 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 , there is extensive hydrogen bonding between the ethanol molecules \left(\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}\right). 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.