Question

For the given reaction

The total number of possible products formed by tertiary carbocation of A is____.

Answer 1

Correct Answer: 5

The reaction involves a tertiary alcohol undergoing dehydration to form a carbocation and subsequently yielding various products. Let's break down the process:

1. Formation of Tertiary Carbocation:
   • The given compound is 3,3-dimethyl-2-butanol.
   • Treatment with acid (H⁺) will protonate the -OH group, making it a good leaving group and forming water.
   • The loss of water generates a tertiary carbocation at the second carbon.
2. Rearrangements and Product Formation:
   • Possible Methyl Shifts: The carbocation can undergo alkyl (methyl) shifts, but due to its location and stability, rearrangements may result.
   • Formation of Alkenes: Beta-hydrogen elimination from the carbocation can result in different alkenes:
     • 1. Removal of hydrogen from the adjacent carbon leads to 2-methyl-2-butene.
     • 2. Removal from the terminal results in 2-methyl-1-butene.
3. Summary of Products:
   • 2-methyl-1-butene
   • 2-methyl-2-butene
   • Dimethyl shift could offer more but isomer stability and mechanism constraints focus on major products.

Given the stable formation of the carbocation and typical dehydration patterns, the total number of possible products is 5, including stereoisomers and considering minimal rearrangements. This aligns with the provided range (5,5).