Which of the following is not a valid resonating structure of the others?

In which of the following is the first resonating structure less stable compared to the second one?

The correct order of $C=O$ bond length in ethyl propanoate $(I)$, ethyl propenoate $(II)$ and ethenyl propanoate $(III)$ is

Among the following,the antiaromatic compounds are:

The order of relative stability of the contributing structures is:
$I: CH_2=CH-CHO$
$II: ^+CH_2-CH=CH-O^-$
$III: ^-CH_2-CH=CH-O^+$
Choose the correct answer from the options given below:

Draw other resonance structures related to the following structure and find out whether the functional group present in the molecule is ortho,para directing or meta directing.