1. Tardigrade
  2. Question
  3. Chemistry
  4. Arrange the following alkenes <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/chemistry/64eaf13ac20e5b58c49d117a9425314f-.jpeg /> <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/chemistry/8eba27e2e574d1cfccb7241753cf0d13-.jpeg /> in decreasing order of their reactivity towards HBr.

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. Arrange the following alkenes
image
image
in decreasing order of their reactivity towards $HBr$.

Hydrocarbons

Solution:

The reactivity depends upon the stability of the carbocation formed by addition of $H^+$. The carbocations resulting from alkenes ($I$, $II$ and $III$) are respectively
image
Since the stability decreases in the order: $Z > Y > X$,
therefore, reactivity decreases in the order : $III > II > I$.