Question

Give reasons for the following : The central carbon-carbon bond in 1, 3 – butadiene is shorter than that in n-butane.

Answer 1

The Carbon–Carbon σ Bond Length in 1,3-Butadiene. The conjugated diene has 2 double bonds with one single C-C bond between them. ... Extended P orbital sharing makes this diene more stable than the isolated dienes. The more stable molecule also has lower energy and a shorter bond length.