Question

What is the major product formed by $HI$ on reaction with $2,2\text{dimethyl but-1-ene}$?

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

Addition of HI to alkene:
In this reaction, the double bond attacks the $H^{+}$ ion to form a relatively stable secondary carbocation. Further, it undergoes 1,2-methyl shift to form a stable tertiary carbocation followed by attack of $I^{-}$ to form the major product.


Hence, option (a) is correct.