Question

What is 'C' in the following reaction sequence? 

• A. Propanone
• B. 2-methyl-2-propanol
• C. 2-methylprop-1-ene
• D. But-2-enal

Hint:

Grignard reagents add to carbonyl compounds to form alcohols, which can undergo elimination under heat to form alkenes.

Answer 1

The Correct Option is C

Step 1: Understanding the Reaction Sequence - The given reaction sequence involves a Grignard reagent (CH\(_3\)MgBr) reacting with a ketone (Propanone) in an ether medium. 
- Adding CH\(_3\)MgBr to Propanone gives an alcohol intermediate (A). 
- Hydrolysis using H\(_3\)O\(^+\) leads to the formation of 2-methyl-2-propanol (B). 
- The final step involves heating with Cu at 573 K, which results in dehydration, forming an alkene as the final product C. 

Step 2: Identifying the Product - The alcohol undergoes elimination to form 2-methylprop-1-ene as the final product. 

Step 3: Correct Answer Thus, the correct answer is 2-methylprop-1-ene.