Which of the following orders of rotation barrier about the $C=C$ bond,as indicated in the structures $(I)$,$(II)$,and $(III)$,is correct?

Given below are two statements $:$
Statement $I :$ Hyperconjugation is not a permanent effect.
Statement $II :$ In general,greater the number of alkyl groups attached to a positively charged $C$ atom,greater is the hyperconjugation interaction and stabilization of the cation.
In the light of the above statements,choose the correct answer from the options given below

What is the difference between inductive effect and resonance effect?

The functional group that shows negative resonance effect ($-R$ effect) is:

Which of the following represents the hyperconjugation effect?

What is the resonance effect? Write about its types. Or,what is the positive and negative resonance effect? Explain with examples.