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The enolic form of ethyl acetoacetate as below has:

1. 16 sigma bonds and 1 pi-bond
2. 9 sigma bonds and 2 pi-bonds
3. 9 sigma bonds and 1 pi-bond
4. 18 sigma bonds and 2 pi-bonds

Correct answer: 16 sigma bonds and 1 pi-bond

Solution

The enolic form of ethyl acetoacetate contains 16 sigma bonds (from single bonds) and 1 pi-bond (from the C=C double bond in the enol group). Counting all bonds confirms this.

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