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(A) Dichloro carbene acts as electrophil...

(A) Dichloro carbene acts as electrophile in Reimer-Tiemann reaction.
(R) Dichloro carbene has two electrons on carbon atom.

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:
B
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The products of bond breaking, shown below, are not stable, and cannot be isolated for prolonged study. Such species are referred to as reactive intermediate, and are belived to be transient intermediates in many reactions. The general structures and names of four such intermediates are, Charged Intermediates Uncharged Intermediates Carbocations (called carbonium ions in the older literature) are electrophiles and carbananions are nucleophiles. Carbenes have only a valence shell sextet of electrons and are therefore electron deficient. In this sense they are elecrophiles, but the non-bonding electron pair also gives carbenes nucleophilic character. As a rule, the electrophilic character dominates carbene reactivity. Carbon radicals have only seven valence electrons, and may be considered electron deficient, however, they do not in general bond to nucleophilic electron pair, so their chemistry exhibits differences from that of conventional electrophiles. Radical intermediates are often called free radicals. Intermediates are in general stabilised with conjugation, electron donating and electron with drawing groups. R-N^(+) equiv N" "Cl^(-) rarr R^(+)+N_(2)+Cl^(-) based on the above, which of the following from R^(+) most readily

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AAKASH SERIES-ALCOHOLS, PHENOLS AND ETHERS-ETHERS (OBJECTIVE EXERCISE-4)
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  2. (A) For the reduction of esters in to alcohols Ni//H2 is preferred tha...

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  3. (A) Dichloro carbene acts as electrophile in Reimer-Tiemann reaction. ...

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  4. (A) : Phenols are more acidic than alcohols. (R): Phenoxide ion is m...

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  5. (A) In methanol C-O bond length is 1.42Å, but in phenol, it is 1.36Å. ...

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  6. (A) o-Nitrophenol is less soluble in water than the m- and p-isomers o...

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  7. (A) Phenol undergoes Kolbe's reaction but not ethanol. (R) Phenox...

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

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

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

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

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

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

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

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

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

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

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

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

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

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