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(A) In monohaloarenes, further electroph...

(A) In monohaloarenes, further electrophilic substitution occurs at ortho and para positions.
(R) In haloarenes, halogen atom is a ring deactivator. 

A

Both (A) and (R) are correct and (R) is the correct explanation of (A)

B

Both (A) and (R) are correct but (R) is not the correct explanation of (A)

C

(A) is True but (R) is False

D

Both (A) and (R) are false

Text Solution

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The correct Answer is:
B
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Explain the fact that in aryl alkyl ethers (i) the alkoxy group activates the benzene ring towards electrophilic substitution and (ii) it directs the incoming substituents to ortho and para positions in benzene ring.

Aryl halides are less reactive than alkyl halides due to the presence partial double character of C - X bond in aryl halides. Arly halides undergo nucleophilic substitution reactions, if electron withdrawing groups are introduced in ortho & para - positions in aryl halides. The reaction mechanism involves two steps. Keeping these points in view answer the following questions. Which compound undergo nucleophilic substitution under mild conditions

Aryl halides are less reactive than alkyl halides due to the presence partial double character of C - X bond in aryl halides. Arly halides undergo nucleophilic substitution reactions, if electron withdrawing groups are introduced in ortho & para - positions in aryl halides. The reaction mechanism involves two steps. Keeping these points in view answer the following questions. The number of resonance structure possible for chlorobenzene is

Aryl halides are less reactive than alkyl halides due to the presence partial double character of C - X bond in aryl halides. Arly halides undergo nucleophilic substitution reactions, if electron withdrawing groups are introduced in ortho & para - positions in aryl halides. The reaction mechanism involves two steps. Keeping these points in view answer the following questions. Which of the following is the correct order of reactivity of the aryl halides with a given nucleophile

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:

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) The reaction of toluene with Cl_2 in presence of FeCl_3 gives predominantly:

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AAKASH SERIES-ALKYL AND ARYL HALIDES-OBJECTIVE EXERCISE - 4 (ASSERTION (A) & REASON (R) TYPE QUESTIONS)
  1. (A) Towards SN2 reaction, order of reactivity is CH3Br > CH3CH2Br > (C...

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  2. (A) Pure chloroform does not give precipitate with AgNO3 solution. (...

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  3. (A) Addition of bromine to 2-butene yields 2,3-dibromobutane. (R) Br...

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  4. (A) Thionyl chloride reacts with primary alcohols to form pure alkyl h...

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  5. (A) The boiling points of alkyl halides decrease in the order RI > RBr...

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  6. (A) KCN reacts with methyl chloride to give methyl cyanide and methyl ...

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  7. (A) In monohaloarenes, further electrophilic substitution occurs at or...

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  8. (A) Benzonitrile is prepared by the action of chlorobenzene with KCN ...

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  9. (A) Styrene on reaction with HBr gives 1-bromo-1-phenyl ethane. (R) ...

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  10. (A) NBS is a specific reagent for allylic bromination (R) Allylic br...

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  11. (A) Benzyl bromide when kept in acetone - water, produces benzyl alcoh...

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  12. (A) 2-Bromobutane on reaction with sodium ethoxide in ethanol gives 1-...

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  13. (A) Chloral reacts with phenyl chloride to form DDT (R) It is an ele...

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  14. (A) CH3overset(Cl)overset(|)(C)HCH2CH3overset(Alc.KOH)(rarr)CH3CH=CHCH...

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  15. (A) Addition of HBr on but-2-ene gives two structural isomeric product...

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  16. (A) The nature of the solvent can influence the rotation of plane pola...

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  17. (A) SN2 reactions are exothermic (R) SN2 reactions are thermochemica...

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  18. (A) Chloroform can be used as general anaesthetic. (R) In presence o...

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  19. (A) Ethyl chloride gives C2H5CN as major product with alc. KCN but C2H...

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