Question

Consider the following statements and choose the correct statements: (A) The bond angle in methanol is slightly higher than the tetrahedral angle. (B) The reaction of Grignard reagent with methanal produces a secondary alcohol. (C) The boiling point of ethanol is higher than methoxymethane. (D) Acetylation of salicylic acid produces Aspirin.

• (A) and (D) only
• (A) and (B) only
• (B) and (C) only
• (C) and (D) only

Hint:

Grignard reagent + methanal gives a primary alcohol, with any other aldehyde gives a secondary alcohol, and with ketones gives a tertiary alcohol.

Answer 1

The Correct Option is D

Step 1: Analyse statement (A).
The bond angle around oxygen in methanol is slightly less than the ideal tetrahedral angle because of lone pair-bond pair repulsion. Therefore statement (A) is incorrect.

Step 2: Analyse statement (B).
Reaction of a Grignard reagent with methanal gives a primary alcohol. \[ RMgX + HCHO \rightarrow RCH_2OH \] Therefore statement (B) is incorrect.

Step 3: Analyse statement (C).
Ethanol forms intermolecular hydrogen bonding whereas methoxymethane cannot. Hence ethanol possesses a higher boiling point. Statement (C) is correct.

Step 4: Analyse statement (D).
Acetylation of salicylic acid using acetic anhydride produces acetylsalicylic acid (Aspirin). Therefore statement (D) is correct.

Step 5: Select the correct statements.
Only statements (C) and (D) are correct. \[ {(C)\ \text{and}\ (D)} \]