Fundamental Concepts in Organic Reaction Mechanism — Prelims Questions

Which of the following carbocations is the most stable?

Which of the following species acts as an electrophile?

Which of the following compounds will exhibit the strongest -I effect?

Which of the following statements about resonance effect is incorrect?

Arrange the following carbanions in order of increasing stability: $CH_3^-$, $CH_3CH_2^-$, $(CH_3)_2CH^-$, $(CH_3)_3C^-$.

Which of the following groups is an ortho-para director and a deactivating group in electrophilic aromatic substitution?