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

Identify the species from the following that exhibits no-bond resonance.

Which of the following $\sigma$-bonds participate in hyperconjugation?

In which of the following molecules is the electron density on the oxygen atom $NOT$ correctly mentioned?

In the compound given below,the correct order of the acidity of the positions $(X)$,$(Y)$ and $(Z)$ is:

Identify the most stable species in the following set of ions giving reasons.
$(a) \ \stackrel{+}{C} H_{3}, \stackrel{+}{C} H_{2} Br, \stackrel{+}{C} HBr_{2}, \stackrel{+}{C} Br_{3}$
$(b) \ \stackrel{\Theta}{C} H_{3}, \stackrel{\Theta}{C} H_{2} Cl, \stackrel{\Theta}{C} HCl_{2}, \stackrel{\Theta}{C} Cl_{3}$