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(A) During acid catalysed esterification...

(A) During acid catalysed esterification, oxygen atom of alcohol is present in ester molecule
(R) Alcohol acts as a nucleophile

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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(A) Alcohols can act as nucleophiles (R) Alcohols form salts with alkali metals

Hydroboration is a reaction in which the boron hydride acts as an electrophile, R_2BH adds to a carbon - carbon double which acts as a nucleophile Organoborane compound The organoborane compound then is oxidised by treatment with hydrogen peroxide in aqueous sodium hydroxide to from alcohol. The OH group enters the carbon atom from the same side where the boron atom was present. Hence this reaction is highly regioselective and the boron atom attacheto that carbon atom which is less sterically hindred. Hydroboration oxidation and acid hydration will not give the same products in case of

Hydroboration is a reaction in which the boron hydride acts as an electrophile, R_2BH adds to a carbon - carbon double which acts as a nucleophile Organoborane compound The organoborane compound then is oxidised by treatment with hydrogen peroxide in aqueous sodium hydroxide to from alcohol. The OH group enters the carbon atom from the same side where the boron atom was present. Hence this reaction is highly regioselective and the boron atom attacheto that carbon atom which is less sterically hindred. Hydroboration oxidation and acid hydration will not give the same products in case of

Hydroboration is a reaction in which the boron hydride acts as an electrophile, R_2BH adds to a carbon - carbon double which acts as a nucleophile Organoborane compound The organoborane compound then is oxidised by treatment with hydrogen peroxide in aqueous sodium hydroxide to from alcohol. The OH group enters the carbon atom from the same side where the boron atom was present. Hence this reaction is highly regioselective and the boron atom attacheto that carbon atom which is less sterically hindred.

Hydroboration is a reaction in which the boron hydride acts as an electrophile, R_2BH adds to a carbon - carbon double which acts as a nucleophile Organoborane compound The organoborane compound then is oxidised by treatment with hydrogen peroxide in aqueous sodium hydroxide to from alcohol. The OH group enters the carbon atom from the same side where the boron atom was present. Hence this reaction is highly regioselective and the boron atom attacheto that carbon atom which is less sterically hindred.

AAKASH SERIES-ALCOHOLS, PHENOLS AND ETHERS-ETHERS (OBJECTIVE EXERCISE-4)
  1. (A) In ethers, bond angle C-O-C is more than tetrahedral angle (R...

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  2. (A) n-propyl alcohol is prepared from propene by the action of B2H6 f...

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  3. (A) During acid catalysed esterification, oxygen atom of alcohol is pr...

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  4. (A) Lucas reagent is used to distinguish 1^@ , 2^@ and 36@ alcohols ...

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  5. (A) Addition of water to (CH3)2 - C = CH - CH3 gives (CH3)2 - COH - C...

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  6. (A) 1-propanol & 2-propanol can be distinguished by haloform test ...

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  7. (A) Alcohols are acidic in nature but donot react with NaOH solution ...

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  8. (A) The acidity of alcohols follow the order 1^@ gt 2^@ gt 3^@ (R...

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  9. (A) For the reduction of esters in to alcohols Ni//H2 is preferred tha...

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

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

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

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

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

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

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

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

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

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

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

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