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 $C H_{3} CH = CH - CHO$ the $C = O$ pi electrons are pushed onto oxygen.

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 $C H_{3} CH = CH - CHO$ the $C = O$ pi electrons are pushed onto oxygen.

TestHub · Accepted Answer

The pi pair becomes a lone pair on oxygen, which keeps an octet. No single bond is broken. No violation.

Chemistry - GOC Question with Solution | TestHub