Which of the following species has a positive charge that is not involved in resonance?

The most stable resonating structure is

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

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 $:$

The correct order of decreasing length of the bond as indicated by the arrow in the following structures is:

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: