MDCAT Chemistry MCQ #5421

Silicon tetrachloride reacts violently with water to form silicic acid, whereas Carbon tetrachloride does not react. What structural feature of Silicon allows this mechanism?

MDCAT Chemistry MCQ #5421

  1. Question 1

    Q1. Silicon tetrachloride reacts violently with water to form silicic acid, whereas Carbon tetrachloride does not react. What structural feature of Silicon allows this mechanism?

    • A) Formation of a stable carbocation
    • B) Coordination of water to vacant d-orbitals
    • C) Elimination of chlorine as a radical
    • D) Hydrogen bonding between Si and Oxygen

    Answer: Coordination of water to vacant d-orbitals

    Explanation: Silicon has vacant 3d orbitals that allow water to coordinate as a nucleophile; Carbon lacks d-orbitals, making CCl4 resistant to hydrolysis.