Assertion (A): The boiling point of ethanol is higher than that of methoxymethane.
Reason (R): There is intramolecular hydrogen bonding in ethanol.
Reason (R): There is intramolecular hydrogen bonding in ethanol.
Show Hint
- Assertion (A) is true, but Reason (R) is false.
- Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
- Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
- Assertion (A) is false, but Reason (R) is true.
The Correct Option is A
Solution and Explanation
To solve this question, let's analyze the assertion and reason provided.
Assertion (A):
The boiling point of ethanol is higher than that of methoxymethane.
Reason (R):
There is intramolecular hydrogen bonding in ethanol.
1. Boiling Points of Ethanol and Methoxymethane:
Ethanol (C2H5OH) has a higher boiling point compared to methoxymethane (CH3OCH3). The reason for this difference is primarily due to the presence of hydrogen bonding in ethanol.
2. Hydrogen Bonding in Ethanol:
Ethanol exhibits intermolecular hydrogen bonding between the -OH group of one ethanol molecule and the hydrogen of another ethanol molecule. This strong intermolecular force requires more energy to break, resulting in a higher boiling point for ethanol compared to methoxymethane.
3. Evaluation of Assertion (A):
The assertion that ethanol has a higher boiling point than methoxymethane is correct. Methoxymethane, a simple ether, does not exhibit hydrogen bonding, resulting in a lower boiling point compared to ethanol.
4. Evaluation of Reason (R):
The reason provided is not entirely accurate. While it is true that ethanol has hydrogen bonding, it is intermolecular hydrogen bonding, not intramolecular hydrogen bonding, that influences the boiling point. Therefore, the reason is incorrect.
5. Conclusion:
The assertion is correct, but the reason is incorrect. Ethanol has a higher boiling point due to intermolecular hydrogen bonding, not intramolecular hydrogen bonding.
Final Answer:
The correct option is that the assertion is true, but the reason is false.
Top Questions on Alcohols, Phenols And Ethers
- Write the structures of (A), (B), and (C) in the following reaction:
Reaction Scheme: \[ (C) \xleftarrow{\text{conc. } HNO_3} \text{Phenol} \xrightarrow{\text{dil. } HNO_3} (A) + (B) \]- UP Board XII - 2026
- Chemistry
- Alcohols, Phenols And Ethers
- Which of the following Grignard Reagent will be used to prepare cyclohexylmethanol when treated with methanal?
- CBSE CLASS XII - 2026
- Chemistry
- Alcohols, Phenols And Ethers
- Write the reaction involved in Friedel-Crafts acylation of anisole.
- CBSE CLASS XII - 2026
- Chemistry
- Alcohols, Phenols And Ethers
- Write the reaction involved in Kolbe’s reaction.
- CBSE CLASS XII - 2026
- Chemistry
- Alcohols, Phenols And Ethers
- Write the reaction involved in Reimer-Tiemann reaction.
- CBSE CLASS XII - 2026
- Chemistry
- Alcohols, Phenols And Ethers
Questions Asked in CBSE CLASS XII exam
- Find the general solution of the differential equation \[ y\log y\,\frac{dx}{dy}+x=\frac{2}{y}. \]
- CBSE CLASS XII - 2026
- Differential Equations
- A square loop of side 0.50 m is placed in a uniform magnetic field of 0.4 T perpendicular to the plane of the loop. The loop is rotated through an angle of 60° in 0.2 s. The value of emf induced in the loop will be:
- CBSE CLASS XII - 2026
- Electromagnetic induction
A racing track is built around an elliptical ground whose equation is given by \[ 9x^2 + 16y^2 = 144 \] The width of the track is \(3\) m as shown. Based on the given information answer the following:
(i) Express \(y\) as a function of \(x\) from the given equation of ellipse.
(ii) Integrate the function obtained in (i) with respect to \(x\).
(iii)(a) Find the area of the region enclosed within the elliptical ground excluding the track using integration.
OR
(iii)(b) Write the coordinates of the points \(P\) and \(Q\) where the outer edge of the track cuts \(x\)-axis and \(y\)-axis in first quadrant and find the area of triangle formed by points \(P,O,Q\).
- CBSE CLASS XII - 2026
- Integration
- Consider a cylindrical conductor of length \( l \) and area of cross-section \( A \). Current \( I \) is maintained in the conductor and electrons drift with velocity \( \vec{v}_d \, (|\vec{v}_d| = \frac{eE}{m} \tau) \), where symbols have their usual meanings. Show that the conductivity of the material of the conductor is given by \[ \sigma = \frac{n e^2 \tau}{m}. \]
- CBSE CLASS XII - 2026
- Current Density
- The painting Hazrat Nizamuddin Auliya and Amir Khusro belongs to which sub-school of Deccan Miniature?
- CBSE CLASS XII - 2026
- Indian Miniature Paintings and Museums