Question

The Product formed in the following multistep reaction is

• A.
• B.
• C.
• D.

Hint:

Grignard reagents react with aldehydes to form secondary alcohols, while ketones form tertiary alcohols.

Answer 1

The Correct Option is B

Reaction Sequence and Products 

Step-by-Step Process:

1. Hydroboration-Oxidation:
   • The double bond in \( CH_3−CH = CH_2 \) undergoes hydroboration followed by oxidation.
   • Product: \( CH_3−CH_2−CH_2−OH \) (1-propanol).
2. Oxidation by PCC (Pyridinium Chlorochromate):
   • The primary alcohol \( CH_3−CH_2−CH_2−OH \) is oxidized to an aldehyde.
   • Product: \( CH_3−CH_2−CHO \) (propanal).
3. Grignard Reaction:
   • Propanal \( CH_3−CH_2−CHO \) reacts with a Grignard reagent \( CH_3MgBr \).
   • This forms a secondary alcohol.
   • Product: \( CH_3−CH_2−CH(OH)−CH_3 \) (2-butanol).

Final Product:

The final product of the sequence is 2-butanol (\( CH_3−CH_2−CH(OH)−CH_3 \)).