Question
Number of $\pi$-electrons in cyclobutadienyl anion $\left(\mathrm{C}_{4} \mathrm{H}_{4}\right)^{2-}$ is(a) 2(b) 4(c) 6(d) 8
Step 1
Cyclobutadiene (C4H4) has 4 carbon atoms and 4 hydrogen atoms. Each carbon atom contributes 4 electrons, and each hydrogen atom contributes 1 electron. So, the total number of electrons in the neutral molecule is: 4(4) + 4(1) = 16 + 4 = 20 electrons Show more…
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