In which of the following molecule (observed dipole moment) is found to be greater than (expected dipole moment) ? [SEE DIAGRAM]

Question

In which of the following molecule $\mu_{exp.}$ (observed dipole moment) is found to be greater than $\mu_{th.}$ (expected dipole moment) ? [SEE DIAGRAM]

Prashant Kotian · Accepted Answer

Correct answer: A,B,C,D. Step 1: The dimer of BH3 is diborane (B2H6). In diborane, each boron atom forms four bonds (two terminal B-H 2c-2e bonds and two bridging B-H-B 3c-2e bonds) using four sp3 hybrid orbitals. Step 2: The dimer of BeH2 is Be2H4. In Be2H4, each beryllium atom is connected to two terminal hydrogens and two bridging hydrogens (forming a planar ring) using sp2 hybrid orbitals. Step 3: Thus, the hybridization of the central atoms in the dimers of BH3 and BeH2 is sp3 and sp2 respectively, matching option (b).

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