Which of the following is most contributing resonating structure of prop-2-enal

Options

A. `overset(Theta)(C) H_(2) -CH=CH-O^(o+)`
B. `overset(.)(C)H_(2)-CH=CH-overset(.)(O)`
C. `overset(o+)(C)H_(2)-CH=CH-O^(Theta)`
D. `CH_(2)=CH-underset(O)underset(||)(C)-H`

Answer

4

Explanation

`CH_(2)=CH-underset(O)underset(||)(C)-H` is most contributing structure