What is the order of $-I$ effect in orbitals?

Which of the following alkyl groups has the maximum $+I$ effect?

Polarization of electrons in acrolein may be written as

Which of the following represents the hyperconjugation effect?

Identify the functional group that has electron donating inductive effect.

State True or False for the following statements:
$(i)$ The stability is explained by resonance effect and hyperconjugation.
$(ii)$ The resonance structures are drawn in resonance and hyperconjugation.
$(iii)$ Hyperconjugation is a bondless resonance.
$(iv)$ In resonance structure,there is movement of electron pair of only $\pi$ bond.