Identify the correct statement for from those given below.

(A) In , all B–H bonds are equivalent.

(B) In , there are four 3-centre-2-electron bonds.

(C) is a Lewis acid.

(D) can be synthesized

Question

Identify the correct statement for  from those given below.

(A) In , all B–H bonds are equivalent.

(B) In , there are four 3-centre-2-electron bonds.

(C)  is a Lewis acid.

(D)  can be synthesized from both  and .

(E)  is a planar molecule.

Choose the most appropriate answer from the options given below:

Canvas Classes · Accepted Answer

Analysis of each statement:

(A) FALSE — B–H bonds are NOT all equivalent. There are 4 terminal B–H bonds (2c-2e) and 2 bridging B–H–B bonds (3c-2e). These have different bond lengths and energies.

(B) FALSE —  has two 3-centre-2-electron (3c-2e) bonds (the bridging B–H–B bonds), not four.

(C) TRUE —  (fragment of ) is electron deficient and acts as a Lewis acid. ✓

(D) TRUE — Synthesis routes:
-  ✓
-  ✓

(E) FALSE —  is NOT planar. It has a butterfly/staggered structure with the bridging H at

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