The false statements among the following areI. A primary carbocat

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 Multiple Choice QuestionsMultiple Choice Questions

41.

The reaction of methyltrichloroacetate (Cl3CCO2Me) with sodium methoxide (NaOMe) generates

  • carbocation

  • carbene

  • carbanion

  • carbon radical


42.

Identify the correct method for the synthesis of the compound shown below from the following alternatives.


43.

What is the end product for the reaction?


44.

Number of chiral centers in the following image is/ are

  • 1

  • 2

  • 3

  • 4


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45.

In the following reaction

The main product (P) is


46.

On Friedal Crafts acetylation, anisol yields

  • 2-methoxyacetophenone

  • 4-methoxyacetophenone

  • Both (a) and (b)

  • None of the above


47.

Compound (A) when heated with ethyl magnesium iodide in dry ether forms an addition product, which on hydrolysis forms compound (B) Compound (B) on oxidation form 3-pantanone. Hence (A) and (B) are respectively 

  • propanal, 3-pentanol

  • pentanol, 3-pentanol

  • ethanal, pentanol

  • acetone, 3-pentanol


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48.

The false statements among the following are

I. A primary carbocation is less stable than a tertiary carbocation.

II. A secondary propyl carbocation is less stable than allyl carbocation.

III. A tertiary free radical is more stable than a primary free radical.

IV. Isopropyl carbanion is more stable than ethyl carbanion.

  • I and II

  • II and III

  • I and IV

  • II and IV


D.

II and IV

Statements II and IV are wrong since 2° propyl carbocation is little more stable than allyl carbocation and ethyl carbanion is more stable than isopropyl carbanion.


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49.

C6H5-NO2 NHClZn-dust A conc. HClcold B 

A and B respectively are

  • None of the above


50.

X and Y in the above given reaction are

  • picric acid, 2,4, 6-tribromophenol

  • 5-nitrophenol acid, 5-bromosalicylic acid

  • o-nitrophenol, o-bromophenol

  • 3, 5-dinitrosalicylic acid, 3,5-dibromosalicylic acid


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