Assertion : Rate of hydrolysis of methyl chloride to methanol is

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 Multiple Choice QuestionsMultiple Choice Questions

771.

CH3CO2C2H5 on reaction with sodium ethoxide in ethanol gives A, which on heating in the presence of acid gives B. Compound B is

  • CH3COCH2COOH

  • CH3COCH3

  • CH2=C(OC2H5)2


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772.

Assertion : Rate of hydrolysis of methyl chloride to methanol is higher in DMF than in water.

Reason : Hydrolysis of methyl chloride follows second order kinetics.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


A.

If both assertion and reason are true and reason is the correct explanation of assertion.

Hydrolysis of methyl chloride to methanol follows SN2 reaction.

Protic solvents, one that contain -OH or -NH group are generally the worst solvents for SN2. Polar protic solvents such as water, alcohols and carboxylic acids have strong dipoles but does not have -OH or -NH groups, are the best.

In contrast to protic solvents, which decrease the rates of SN2 reactants by lowering the ground state energy of nucleophile, polar aprotic solvents (DMF) increase the rates of SN2 reactions by raising the ground state energy of nucleophile.


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773.

CH3-CH2-Cl alc. KOH A, the product is :

  • CH3CH2OK

  • CH3CHO

  • CH3CH2OCH2CH3

  • CH2=CH2


774.

Which ofthe following is involved in Sandmeyer's reaction ?

  • Ferrous salt

  • Diazonium salt

  • Ammonium salt

  • Cupromonium salt


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775.

The reaction :

C2H5OH  SOCl2 Pyridine C2H5Cl + SO2 + HCl is known as :

  • Kharasch effect

  • Williamson's synthesis

  • Darzen's procedure

  • Hunsdiecker reaction


776.

Among the following the dissociation constant is highest for

  • C6H5OH

  • C6H5CH2OH

  • CH3CCH

  • CH3NH3+Cl


777.

Assertion : 2-bromobutane on reaction with sodium ethoxide in ethanol gives 1-butene as a major product.

Reason : 1-butene is more stable than 2-butene.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


778.

Assertion : The major products formed by heating C6H5CH2OCH, with HI are C6H5CH2I and CH3OH.

Reason : Benzyl cation is more stable than methyl cation.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


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779.

Assertion : Benzyl bromide when kept in acetone water it produces benzyl alcohol.

Reason : The reaction follows SN2 mechanism.

  • If both assertion and reason are true and the reason is the correct explanation of the assertion.

  • If both assertion and reason are true and the reason is not the correct explanation of the assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


780.

Assertion : Hydroxyketones are not directly used in Grignard reaction.

Reason : Grignard reagents react with hydroxyl group.

  • If both assertion and reason are true and the reason is the correct explanation of the assertion.

  • If both assertion and reason are true and the reason is not the correct explanation of the assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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