(a) (i) Why is the $\text{C}-\text{O}$ bond length in phenols less than that in methanol ? (ii) Arrange the following in order of increasing boiling point : Ethoxyethane, Butanal, Butanol, n-butane (iii) How can phenol be prepared from anisole ? Give reaction. OR (b) (i) Give mechanism of the following reaction : $\text{CH}_3\text{CH}_2\text{OH} \xrightarrow[413\text{ K}]{\text{H}_2\text{SO}_4} \text{CH}_3\text{CH}_2 - \text{O} - \text{CH}_2\text{CH}_3 + \text{H}_2\text{O}$ (ii) Illustrate hydroboration - oxidation reaction with an example.

Year	Paper Code	Set	Position
CBSE 2023	Series Other	Set 1	Question 30
CBSE 2023	Series Other	Set 1	Question 26
CBSE 2023	Series Other	Set 1	Question 28

• Step 1: Stating the fundamental formula / law statement (+1 Mark)
• Step 2: Intermediate mathematical substitution or proof steps (+1 Mark)
• Step 3: Correct final value or conclusion with mandatory SI units (+1 Mark)