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(A) Presence of electron withdrawing gro...

(A) Presence of electron withdrawing groups at p-position, increases the acidic strength of phenols
(R) Presence of electron withdrawing groups at ortho and para position stabilises the phenoxide ion formed

A

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

B

Both (A) and (R) are true and (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:
A
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Identify electron - withdrawing groups in resonance among the following :

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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:

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:

These ions lose electrons to form stable positive ions.

Explain the role of electron withdrawing and electron releasing groups on the acidity of carboxylic acids.

Electron withdrawing groups in benzene ring facilitate nucleophilic substitution. Substantiate

AAKASH SERIES-ALCOHOLS, PHENOLS AND ETHERS-ETHERS (OBJECTIVE EXERCISE-4)
  1. (A) Phenol undergoes Kolbe's reaction but not ethanol. (R) Phenox...

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  2. (A) Phenols are acidic & react with alkalies like NaOH but do not reac...

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  3. (A) Presence of electron withdrawing groups at p-position, increases t...

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  4. (A) Both phenol and phenoxide ion exhibit resonance, phenoxide ion is ...

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  5. (A) Phenol and benzoic acid are distinguished with NaHCO3 solution ...

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  6. (A) O and p nitro phenols are separated by steam distillation (R)...

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  7. (A) Reimer Tiemann reactions of phenol with chloroform in alkali produ...

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  8. (A): Ethers behave as bases in the presence of mineral acids. (R): O...

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  9. (A):Ethers are relatively inert when compared to C(2)H(5)OH. (R): In...

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  10. (A): (CH(3))(3)C-ONa and CH(3)Br react together to form (CH(3))(3)C-O-...

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  11. (A) IUPAC name of the compound CH3 - undersetoverset(|)(CH3)(C)H -...

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  12. (A) Ditertiarybutyl ether cannot be prepared by Williamson's synthesis...

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  13. (A) The major products formed by heating (R) Para amino benzy...

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  14. (A) Anisole undergoes electrophilic substitution reaction at ortho & p...

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  15. (A) Phenetole on cleavage with HI gives phenol & ethyl iodide (R)...

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  16. (A) IUPAC name of is 2-ethoxy1,1,-dimethyl cyclohexane (R) Acco...

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  17. (A) Formation of ether from alcohol is an example of bimolecular nucle...

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  18. (A) To prepare ter.butylethylether, the reactants used are ter.butylbr...

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  19. (A) Ethers are not generally prepared by acid dehydration of 2^@ and 3...

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  20. (A) Methoxy benzene can be prepared by the reaction of C6H5 ONa and CH...

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