Paper: CSIR-NET December 2011 · Subject: Physical Chemistry · Chapter: Group Theory · Topic: Symmetry Elements Point Groups · Marks: 2 · Difficulty: Easy
The molecule diborane belongs to the symmetry point group
(a)$\mathrm{C}_{2 \mathrm{v}}$
(b)$\mathrm{C}_{2 \mathrm{h}}$
(c)$\mathrm{D}_{2 \mathrm{d}}$
(d)$\mathrm{D}_{2 \mathrm{h}}$
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
Diborane with its two bridging hydrogens has three mutually perpendicular C₂ axes, an inversion centre and three mirror planes: D₂h.