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

Which of the following is not correct?

Consider the following compounds. Hyperconjugation occurs in:

In which of the following does the hyperconjugation effect operate?

Identify the correct stability order.

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.