Which of the following isotopic groups exerts the strongest hyperconjugative () effect when attached — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

The magnitude of the hyperconjugative effect depends on the ease of breaking the $C-H$ bond (or no-bond resonance). Because the $C-D$ and $C-T$ bonds are heavier, shorter, and significantly stronger than the $C-H$ bond, they overlap less effectively. Therefore, the $+H$ effect order is $-CH_3 > -CD_3 > -CT_3$.