Q70 · CSIR NET Chemistry, June 2014
Paper: CSIR NET June 2014 · Subject: Physical Chemistry · Chapter: Group Theory · Topic: Symmetry Elements Point Groups · Marks: 2 · Difficulty: Easy
The symmetry point group of propyne is
(a)$\mathrm{C}_{3}$
(b)$\mathrm{C}_{3 \mathrm{v}}$
(c)$\mathrm{D}_{3}$
(d)$\mathrm{D}_{3 \mathrm{d}}$
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
Propyne CH₃–C≡C–H has a C₃ axis and three σ_v planes but no σ_h or perpendicular C₂: C₃v.
Study loop for Group Theory