AP Chemistrymediummcq1 pt
How many sigma and pi bonds does acetylene, C₂H₂, contain?
A.5 sigma and 0 pi
B.3 sigma and 2 pi
C.2 sigma and 3 pi
D.3 sigma and 3 pi
Explanation
Core Concept
Acetylene's skeleton has two C-H single bonds plus one C-C triple bond. Every single bond is one sigma interaction, and a triple bond itself consists of one head-on sigma pair plus two side-by-side pi pairs from two sets of unhybridized p orbitals. Totals: 2 + 1 = 3 sigma and 2 pi.
Correct Answer
B3 sigma and 2 pi
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