Which of the following isotopic alkyl groups exerts the STRONGEST (electron-donating) inductive effe — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

Heavier isotopes of hydrogen form shorter, stronger bonds with carbon that vibrate less. This localizes the electron density closer to the carbon nucleus, resulting in a stronger $+I$ push into the main chain. The order is $-CT_3 > -CD_3 > -CH_3$.