Which of the following has the strongest $+I$ effect?

What is the difference between the mesomeric effect and the resonance effect?

Which of the following molecule$(s)$ has/have delocalised lone pair$(s)$ of electrons?

Give three points of difference between the inductive effect and the resonance effect.

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

In which of the following molecules do all the effects namely inductive,mesomeric and hyperconjugation operate?