Which of the following is most likely to be the first slop in the general mechan

Question

Which of the following is most likely to be the first slop in the general mechanism for electrophilie substitution reactions? Arrange the following compounds in order of decreasing reactivity towards electrophilie aromatic substitution (most reactive first). V>II>I>III>IV II>V>III>I>IV IV>I>III>V>II III>II>I>IV>V IV>V>II>I>III Which one of the following substituents will not direct an incoming group to the ortho/para positions during electrophilic aromatic substitution? -CH_2CH_3 -CF_3 -OCH_3 -NHCH_3 -Br Which one of the following is not a resonance form of the cyclohexadienyl cation (carbocation intermediate, also known as the arenium ion) formed in the bromination of benzene?

Explanation / Answer

7)
arrow points from wlectrron rich part
also, + charge after substitution comes on carbon adjacent to the carbon on which E is added
i and III are wrong because of direction of arrow
IV is wrong because there is no + charge coming on ring
V is wrong because there is no E on the ring
Answer: II

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