Question

1.The best way to describe the "arrow" showing the mechanism of EAS is:

A.it goes from the attacking atom (electrophile) to the carbon being attacked.

B.it goes from the attacking atom to the new bond being formed.

C.it goes from the electron pair in the pi-bond on the ring to the new sigma bond being formed.

D.it involves a half-head arrow from the attacking species and a half-head arrow from the pibond to the new sigma bond to be formed.

2.In general, electrophilic aromatic substitution (EAS) happens:

A.between any aromatic molecule and an appropriate electrophile, assuming aromaticity follows the 2(n + 2) rule.

B.with any pi-bond containing molecule and an electrophile.

C.with chlorine or bromine and iron catalysis on any pi-bond species.

D.when an electrophile bonds to a nucleophile of some kind.

3.EAS with chlorine gas bubbled into chlorobenzene containing aluminum trichloride would:

A.not happen because chlorine is deactivating.

B.gives mostly meta-dichlorobenzene with mild heating.

C.gives mostly ortho-dichlorobenzene with mild heating.

D.generates HCl and mostly para-dichlorobenzene.

4. Fuming nitric acid converts phenol into:

A.pure trinitrophenol (also called "picric acid" which has a really low pKa for a phenolic compound).

B.2, 4-dinitrophenol because of deactivation with each nitro group added.

C.para-nitrophenol since the OH group on an aromatic ring is activating and ortho-para directing.

D.a complex mixture of ortho- and para-substituted phenols with di- and trinitro derivatives predominating.

Answer 1

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a The best way to describe arrow.in. EAS, it goes from electron pair in pibond. on the ring to new sigma bond being formed option (C) is correct e Q2 CDN In general EAS happens, & between any aromatic molecule. and an. appropriate electrophile, assuming aromaticity fallows (ent4) rule. option (A) is correct. in to EAs with cu gas bubbled Gots-ce containg All gives benzene. with mild heating (c) option is correct. on the dichloro

Cat? Por3) cot HNOR fuming NOR ol I NO. 1 so (D) option is correct.nl
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