Question
la) In electrophilie aromatie substitution reactions the-NHr group is an op-director because A) it donates electron density to the ring by induction and destabilizes the m- sigma complex. B) it donates electron density to the ring by resonance and stabilizes the o- and p- sigma complexes. C) it donates electron density to the ring by induction and stabilizes the o- and p- sigma complexes. D)it donates electron density to the ring by resonance and destabilizes the m- sigma complex. 15) The nitration of phenol: A) proceeds more rapidly than the nitration of benzene and yields predominantly the meta product. B) proceeds more rapidly than the nitration of benzene and yields predominantly the ortho, para C)proceeds more slowly than the nitration of benzene and yields predominantly the meta product. D) proceeds more slowly than the nitration of benzene and yields predominantly the ortho, para products. 16) in electrophilic aromatic substitution reactions, an alkyl substituent on the aromatic ring is: A) a deactivator and a m-director. B) a deactivator and an op-director. C) an activator and a m-director. D) an activator and an o,p-director. In electrophilic aromatic substitution reactions the-cN group is: A) a m-director since it destabilizes the meta sigma complex more than the ortho, para. B) an op-director since it stabilizes the ortho, para sigma complex more than the meta. C) a m-director since it destabilizes the meta sigma complex less than the ortho, para D) an o,p-director since it stabilizes the ortho, para sigma complex less than the meta. E) an p.m-director since it stabilizes the ortho, para sigma complex the same as the meta. 8) In electrophilic aromatic substitution reactions, a -NO: substituent on the aromatic ring is: A) a deactivator and a m-director. B) a deactivator and an o,p-director. C) an activator and a m-director. D) an activator and an o,p-director. E) an activator and a p, m-director. 19) Which of the following compounds will undergo bromination least rapidly when treated with Br2 & FeBr3? A) p-methylacetanilide B) bromobenzene C) acetanilide D) chlorobenzene E) nitrobenzene 20) Provide the most appropriate name for the following reaction: Na or Li NH30), ROH cyclohexa-1A-diene (90%) benzene A) Catalytic hydrogenation B) The Heck reaction C) The Friedel-Crafts reactions D) The Suzuki reaction E) The Birch reduction
Explanation / Answer
14 a 15 a 16 b 17 c 18 b 19 c 20 b 21 d 22 b 23 d 24 c 25 a 26 d 27 c 28 b 29 d 30 a 31 d 32 b 33 d 34 a 35 d 36 c 37 b
