1. Tardigrade
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  3. Chemistry
  4. Which of the following second ion is more stable than the first ion:

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Q. Which of the following second ion is more stable than the first ion:

NTA AbhyasNTA Abhyas 2022

Solution:

(A) II : Acetylenic carbanion is more stable than vinylic carbanion because $sp$ hybridised carbon is more electronegative than $sp^2$ hybridised carbon.
(B) I : Benzyl carbanion is more stable ($4$ resonating structures) than allyl carbanion (two resonating structures).
(C) II : Secondary allyl carbanion is less stable than primary allyl carbanion.
(D) I : is aromatic carbanion and (II) is non aromatic carbanion. Aromatic carbanion is more stable than non-aromatic carbanion.