IMO Practice Test — Organic Chemistry: Some Basic Principles and Techniques

12 Questions • 15 min • Olympiad level

15:00
Question 1 of 12
The number of $\sigma$ and $\pi$ bonds in propyne $CH_3−C{\equiv}CH$ is:
6 $\sigma$, 2 $\pi$
5 $\sigma$, 2 $\pi$
6 $\sigma$, 1 $\pi$
7 $\sigma$, 2 $\pi$
Explanation: C−H bonds (4) + C−C (1) + the $\sigma$ of the triple bond (1) = 6 $\sigma$; the triple bond adds 2 $\pi$.