JEE Main · 2023 · 11 Apr 2023 · Shift 2 · Hydrogen

Which hydride among the following is less stable?

(A) $BeH_{2}$ ✓ Correct
(B) $NH_{3}$
(C)HF
(D)LiH

Answer: (A)

Solution

BeH_{2}

is hypovalent (electron-deficient) and therefore less stable compared to the other hydrides. Beryllium has only 2 valence electrons and forms a polymeric structure to achieve stability, making it the least stable among the given hydrides.

JEE Main · 2023 · 11 Apr 2023 · Shift 2 · Single correct option

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