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 Multiple Choice QuestionsMultiple Choice Questions

731.

But-1-ene H3O(CH3COO)2?

The product in the above reaction is

  • CH3CH2CH2CH2OH

  • CH3CH2CH(OH)CH3

  • CH2=CH2CH(OH)-CH3

  • CH3-CH=C(OH)-CH3


732.

Assertion : Aryl sulphunic acid gives phenol or reacting with NaOH at high temperature.

Reason : This reaction is electrophilic substitution reaction.

  • 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.


733.

Assertion: HC= C- is more stable than H2C CH-
Reason : HC C- has more s-character than HC= CH-

  • 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.


734.

Which of the following reaction follows SN1 mechanism ?

  • (CH3)2C-CH2Cl + CH2OK

  • (CH3)2C-CH2Cl + HCl

  • (CH3)3C-Cl + NaOH

  • (CH3)2CHI + H2O


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735.

Find the product for

CH3CH2-O-CH2-CH2-O-CH2-C6H5+ HI (excess)

  • HO-CH2CH2OH, C6H5CH2-I, CH3CH2-I

  • C6H5CH2-OH, CH3CH2-I, I-CH2CH2-OH

  • I-CH2CH2-I, C6H5CH2-I, CH3CH2-OH

  • HO-CH2CH2-OH, C6H5CH2-I, CH3CH2-OH


A.

HO-CH2CH2OH, C6H5CH2-I, CH3CH2-I

Presence of excess of HI favours SN1 mechanism. Therefore, formation of products is controlled by the stability of the carbocation resulting in the cleavage of C - O bond in protonated ether. Thus, the product for given equation are C6H5CH2I, CH3CH2I, HOCH2 - CH2OH.


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736.

SN2 reaction readily occurs in

  • CH3CH2-O-CH3

  • CH3-C(CH3)2-O-CH3

  • CH2=CH-CH2-O-CH3

  • Ph-CH2-O-CH2-CH3


737.

An alkyl halide reacts with alcoholic ammonia in a sealed tube , the product formed will be :

  • a primary amine

  • a secondary amine

  • a tertiary amine

  • a mixture of all the three


738.

The major product of the following reaction is


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739.

The catalyst used in the preparation of an alkyl chloride by the action of dry HCl on an alcohol is :

  • anhydrous AlCl3

  • Fecl3

  • anhydrous ZnCl2

  • Cu


740.

In the reaction ,

R - X Alcoholic KCN B Dilute HCI  B

The product B is :

  • alkyl chloride

  • aldehyde

  • carboxylic acid

  • ketone


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