# 1,3-butadiene is drawn in the s-cis (cisoid) conformation in the introduction. Is this the preferred conformation? Explain. Why is the s-cis conformation shown?

Since the middle bond between ${C}_{2} - {C}_{3}$ is single, it can rotate freely.
Only if the $H$'s around that bond were replaced by other atoms, that either reject or attract one another, would there be a preferred (not obligate) position.