Identify the group that exerts electron withdrawing resonance effect.

In which type of molecule are the electrons of a $\pi$ bond delocalized?

Negative inductive effect ($-I$ effect) is shown by:

In the following resonance structures,the curved arrow indicates that electrons are shifted from:

Identify the lowest positive charge developed (indicated by $\delta, \delta_1, \delta_2, \delta_3$) due to the inductive effect in the following compound: $CH_3-CH_2-CH_2-CH_2-Cl$.

Represent hyperconjugation in $CH_3-CH_2^+$ and $CH_3-CH=CH_2$ by figure.