Assertion (A): Reaction of 1-butene with HBr gives 1-bromobutane

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 Multiple Choice QuestionsMultiple Choice Questions

231.

Compound  which of the following prefix?

  • trans

  • Anti

  • E

  • Z


232.

Friedel-Crafts reaction is not related with

  • acylation

  • reduction

  • sulphonation

  • nitration


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233.

Assertion (A): Reaction of 1-butene with HBr gives 1-bromobutane as major product.

Reason (R): Addition of hydrogen halides to alkenes proceeds according to Markownikoffs rule.

The correct answer is

  • A and R are correct and R is the correct explanation of A

  • A and R are correct but R is not the correct explanation of A.

  • A is correct but R is not correct

  • A is not correct but R is correct


D.

A is not correct but R is correct

According to Markownikoff's rule, the addition of reagents such as HX, H2O and HOX with unsymmetrical alkanes occurs in such a way that the negative part of the adding molecule goes to that carbon atom of the double bond which carries lesser number of hydrogen atoms.

 CH3CH2CH=CH2 + HBrAbsence of peroxidesDark CH3CH2-CHBr-CH32-bromobutane (major product) + CH3CH3-CH2-CH2-Br1- bromobutane ( minor product)


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234.

The product (Z) of the following reaction is:

       


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235.

What is the product in the following reaction?

  • Benzoquionone

  • Cyclohexane-1-one

  • Benzoic sulphate

  • Benzoric acid


236.

Which one of the following has highest boiling point?

  • H3CCH2CH2CH2Cl

  • (H3C)2CHCH2Cl

  • (H3C)3CCl

  • H3CCH2CHClCH3


237.

The product Z of the following reaction is H3CC≡CH 2HBr Z.

  • H3CCH2CHBr2

  • H3CCBr2CH3

  • H3CCHBrCH2Br

  • BrCH2CH2CH2Br


238.

Identify X and Y in the following reaction sequence

X Zn Y Zn-H2OO3 (CH3)2CO + CH2O

  •  

    X Y
    (CH3)2CHBrCH3 CH3CH=CHCH3
  • X Y
    (CH3)2CHCH2Br CH3CH=CHCH3
  • X Y
    (CH3)2CBrCH2Br (CH3)2C=CH2
  • X Y
    (CH3)2CHCHBr2 (CH3)2C=CH2

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239.

Oxidation of cyclohexene in presence of acidic potassium permaganate leads to

  • glutaric acid

  • adipic acid

  • pimelic acid

  • succinic acid


240.

Cyclopentadienyl anion is

  • benzenoid and aromatic

  • non-benzenoid and aromatic

  • non-benzenoid and non-aromatic

  • non-benzenoid and anti- aromatic


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