When considering the kinetic isotope effect and hyperconjugation involving different isotopes of hyd — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

Because the C-D and C-T bonds are progressively heavier and stronger, they vibrate less and overlap less effectively with empty p-orbitals. Thus, their hyperconjugative ability is weaker ($-CH_3 > -CD_3 > -CT_3$). Conversely, shorter, tighter bonds mean the electron density is closer to the carbon, increasing their inductive push ($-CT_3 > -CD_3 > -CH_3$). Statement D is false; hyperconjugation is no-bond resonance, not actual cleavage.