Paper: CSIR-NET December 2011 · Subject: Physical Chemistry · Chapter: Group Theory · Topic: Symmetry Elements Point Groups · Marks: 2 · Difficulty: Medium
The symmetry point group of the most stable geometry of the following molecule $\mathrm{Cl}(\mathrm{H}) \mathrm{C}=\mathrm{C}=\mathrm{C}(\mathrm{H}) \mathrm{Cl}$ is
(a)$\mathrm{C}_{2}$
(b)$\mathrm{C}_{1}$
(c)$\mathrm{C}_{2 \mathrm{v}}$
(d)$\mathrm{C}_{2 \mathrm{h}}$
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
1,3-Dichloroallene has its two ClHC= planes perpendicular; the only symmetry element is a C₂ axis bisecting them (the molecule is chiral): C₂.