Shown below is the structure of methyl acetate with three different $\alpha, \beta$ and $\gamma$ carbon-oxygen bonds.
The correct order of bond lengths of these bonds is:

Given below are two statements.
Statement $I :$ The dipole moment of $CH_3-CH=C(CH_3)-CH=O$ is greater than $CH_3-CH_2-CH_2-CH=O$.
Statement $II :$ $C_1-C_2$ bond length of $CH_3-CH=CH-CH=O$ is greater than $C_1-C_2$ bond length of $CH_3-CH_2-CH_2-CH=O$.
In the light of the above statements,choose the correct answer from the options given below $:$

Which of the following species does not exert a resonance effect?

Resonance effect is not observed in

Compare the ease of carbon-carbon bond rotation across $A, B,$ and $C$.

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