Question

Draw the five resonance structures of the cyclopentadienyl anion. -Are all carbon-carbon bonds equivalent? -How many absorption lines would you expect to see in the 1H NMR and 13C NMR

Please show work

Answer 1

Answer – Given cyclopentadienyl anion and we need to draw the five resonance structures and also find the absorption lines would you expect to see in the 1H NMR and 13C NMR.

There are all carbon-carbon bonds equivalent, since there is resonance and every bond converted to single and double, so there is each bond is intermediate between the single and double bond.

Resonance structure –

In the cyclopentadienyl anion there are 3 absorption lines in ¹HNMR and 3 absorption lines in ¹³CNMR.