The number of 2-centre-2-electron and 3-centre-2-electron bonds in , respectively, are:

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Structure of  (diborane):

- 4 terminal B–H bonds: Each is a normal 2-centre-2-electron (2c-2e) bond → 4 bonds of 2c-2e type
- 2 bridging B–H–B bonds: Each is a 3-centre-2-electron (3c-2e) bond (banana bond) → 2 bonds of 3c-2e type

Total: 4 (2c-2e) + 2 (3c-2e) = 6 bonds, using 12 electrons (6 from 2B + 6 from 6H).

Answer: Option (1) — 4 and 2

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