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In the electrophilic substitution of ben...

In the electrophilic substitution of benzene, to restore aromatic character sigma comlex releases proton from

A

`sp^(3)`- hybridised carbon

B

`sp^(2)`- hybridised carbon

C

sp - hybridised carbon

D

Any one of the carbons

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A
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The typical reaction of benzene and other aromatic compounds is electrophilic substitution. Presence of electron donating group activates the ring towards electrophilic substitution, while presence of electron withdrawing group deactivates the ring towards electrophilic substitution but at the same time activates the ring towards nucleophilic substitution. Some groups are predominantly meta directing and all of these are deactivating. Except halogen, most of the o- and p- directing groups are activating groups. (E.A.S = Electrophilic aromatic substation) Presence of nitro group in benzene ring:

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Electrophilic substitution on mono substituted benzene is determined by electronic effects +1, -M groups are ortho, para directors, where as -1,-M groups are meta directions. When there is a competition between inductive and mesomeric effects, the latter wins over. Electrophilic substitution on disubstituted benzene is determined by the combined effect of both groups. Usually activating group wins over deactivating group. When one of the groups has a lone pair of electrons, that will determine the product formation. Usually a third group will not enter the position in between the two existing groups due to steric reasons. Identify the incorrect statement

AAKASH SERIES-AROMATIC HYDROCARBONS-OBJECTIVE EXERCISE-2
  1. The reagent used for converting benzene to ethyl benzene is

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  2. Benzene on treating with a mixture of conc. HNO(3) and H(2)SO(4) at 1...

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  3. The correct relation among the following is

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  4. Arrange the following compound in the descending order of their reacti...

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  5. Which of the following group is meta directing and ring deactivating

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  6. The decreasing order of reactivity of C(2)H(6), C(2)H(4), C(2)H(2) an...

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  7. The ratio of the number of hybrid and pure orbitals in C(6)H(6) used f...

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  8. In the electrophilic substitution of benzene, to restore aromatic cha...

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  9. According to Huckel's ruel to explain aromaticity the compound has to...

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  10. When acetylene is passed through red hot iron tube, compound 'X' is f...

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  11. A mixture of benzene and aniline can be separated by

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  12. C(6)H(6)+CH(3)Cl to C(6) H(5) CH(3) +HCl The above reaction is an ...

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  13. When phenol is distilled with Zn dust then it gives

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  14. Identify the reagents A and B used in the following reactions

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  15. Which one of the following causes cancer?

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  16. Benzene on ozonolysis followed by reaction with Zn+H(2)O gives

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  17. Which one of the following statements is correct?

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  18. Consider the nitration of benzene using mixed conc. H2SO4 and HNO3 If ...

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  19. 1,2,5, 6- Dibenzation of the following

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  20. Which of the following enter into human body and undergos various bioc...

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