Identify the correct statement(s) regarding electrophilic addition reactions (EAR) of alkenes: — Reaction Mechanism Chemistry Question

💡 Solution & Explanation

The first, slow step of EAR is the attack of the electrophile on the electron-rich $\pi$ -bond, yielding a carbocation (A is true). Electron-donating groups increase the $\pi$ -electron density, accelerating the electrophilic attack (B is true). Since a true carbocation intermediate is formed, rearrangements are highly possible (C is true). While addition of halogens ($Br_2$) is anti-stereospecific (via a bromonium ion), addition of $HX$ or water is not strictly stereospecific because the carbocation is planar (D is false).