How many S — S bonds, S — O — S bonds, sigma-bonds, pi-bonds are present in trimer of sulphur trioxi — Chemical Bonding Chemistry Question

💡 Solution & Explanation

Step 1: The trimer of sulfur trioxide is cyclic (S3O9), with a six-membered ring of alternating sulfur and oxygen atoms: -S-O-S-O-S-O-. Step 2: There are no direct S-S bonds (0) and three S-O-S linkages (3). Step 3: The ring contains 6 S-O sigma bonds, and each of the three sulfur atoms has two terminal double-bonded oxygens (6 S=O bonds, which contribute 6 sigma and 6 pi bonds). This yields a total of 12 sigma bonds and 6 pi bonds.