Question

'X' is: 

• A.
• B.
• C.
• D.

Hint:

Remember Markovnikov’s rule for electrophilic addition reactions. The most stable carbocation intermediate leads to the major product.

Answer 1

The Correct Option is B

Step 1: Identify the Reactants
The reactants are tetrahydrofuran (THF) and 2-methylpropene. The reaction is catalyzed by HF and takes place under heat. 
Step 2: Determine the Reaction Mechanism
This reaction is an electrophilic addition of THF to the alkene. HF protonates the alkene to form a carbocation. The oxygen in THF acts as a nucleophile and attacks the carbocation. Finally, deprotonation occurs to yield the product.
Step 3: Determine the Major Product
The major product is determined by Markovnikov’s rule, which states that the proton adds to the carbon of the double bond with more hydrogens. In this case, the carbocation will form on the more substituted carbon of 2-methylpropene, leading to product (1).