Considering the isotopic substitution of hydrogen in alkyl groups, what is the correct decreasing order of the positive inductive () effect exerted by the groups?

Question

Considering the isotopic substitution of hydrogen in alkyl groups, what is the correct decreasing order of the positive inductive ($+I$) effect exerted by the groups?

Prashant Kotian · Accepted Answer

Correct answer: B. The effect order for isotopes of hydrogen is . This occurs because heavier isotopes have a shorter average bond length, concentrating electron density closer to the carbon atom, enhancing the electron-donating capability of the group. Hence, .

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