C-1 : never break a single bond while drawing a resonance structure.
C-2 : never exceed the octet of a second-period atom (C, N, O).
For the curved-arrow move described below, which statement is correct ?
In CH₃CH₂-O-R a lone pair on oxygen is pushed to make a C=O bond with the adjacent CH₂ carbon.

Question

C-1 : never break a single bond while drawing a resonance structure.

C-2 : never exceed the octet of a second-period atom (C, N, O).

For the curved-arrow move described below, which statement is correct ?

structure

In CH₃CH₂-O-R a lone pair on oxygen is pushed to make a C=O bond with the adjacent CH₂ carbon.

TestHub · Accepted Answer

The CH₂ carbon already has four bonds. A new C=O bond gives it five. C-2 is violated.

Chemistry - GOC Question with Solution | TestHub