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2013 USNCO Problem 54: Sigma and Pi bonds

Source:

April 19, 2013

Problem Statement

How many sigma (σ)(\sigma) and pi (π)(\pi) bonds are in a molecule of ethyne (acetylene), \ce{HCCH}?
<spanclass=′latex−bold′>(A)</span>1σ and 1π<spanclass=′latex−bold′>(B)</span>2σ and 1π<spanclass=′latex−bold′>(C)</span>2σ and 3π<spanclass=′latex−bold′>(D)</span>3σ and 2π <span class='latex-bold'>(A) </span> 1 \sigma \text{ and } 1 \pi \qquad<span class='latex-bold'>(B) </span>2 \sigma \text{ and } 1 \pi \qquad<span class='latex-bold'>(C) </span>2 \sigma \text{ and } 3\pi \qquad<span class='latex-bold'>(D) </span>3 \sigma \text{ and } 2 \pi\qquad
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