The enolic form of ethyl acetoacetate as below has:

• Correct answer
  A

  18 sigma bonds and 2 pi-bonds
• B

  16 sigma bonds and 1 pi-bonds
• C

  9 sigma bonds and 2 pi-bonds
• D

  9 sigma bonds and 1 pi-bonds

Solution

$18\mathrm{ }\mathrm{\sigma }$ and $2\mathrm{\pi }$ bonds in both keto and enol form of ethyl acetoacetate.

Hence, the correct answer is option: 'A'.