The incorrect statement about B2H6 is:
p-Block Elements (Class 11) · Class 11 · JEE Main Previous Year Question
The incorrect statement about is:
- a✓
All B–H–B angles are of
- b
The two B–H–B bonds (bridged and terminal) are not of same length.
- c
Terminal B–H bonds have less p-character when compared to bridging bonds.
- d
Its fragment, , behaves as a Lewis acid.
All B–H–B angles are of
Strategy: Identify the incorrect statement about (diborane).
Step 1: Analysing Each Option
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(A) "All B–H–B angles are 120°": ❌ Incorrect. The B–H–B bridge bond angles in diborane are approximately 83–84°, not 120°. The H–B–H angles for terminal bonds are ~121°, and the B–H–B bridge angles are narrowed by the geometry of the bridge. Angles of 120° would imply hybridisation which is incorrect.
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(B) "Bridge and terminal B–H bonds differ in length": ✅ Correct. Terminal B–H ≈ 119 pm; bridge B–H ≈ 133 pm (longer, weaker 3c-2e bonds).
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(C) "Terminal B–H bonds have less p-character than bridging": ✅ Correct. Terminal B–H bonds are in orbitals with ~25% s-character; bridge bonds involve more p-character.
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(D) " behaves as Lewis acid": ✅ Correct. BH₃ is electron-deficient.
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