The arrangement in decreasing order of stability of C∙H3,C2∙H5,(CH3)2C∙H and (CH3)3 C∙ free radicals is-

3. C2∙H5 > C∙H3 > (CH3)2C∙H > (CH3)3 C∙

  •  C∙H3 > C2∙H5 > (CH3)2C∙H > (CH3)3 C∙  

  • (CH3)3 C∙ > (CH3)2C∙H > C2∙H5 > C∙H3

  • 4. (CH3)3 C∙ > (CH3)2C∙H >  C∙H3 >C2∙H5

  • 4

The species that contains only three pairs of electrons among the following is-

  • Carbocation

  • Carbanion

  • Free radical

  • None of the above

H2C = O behaves as:

  • Nucleophile

  • Electrophile

  • Both (1) and (2)

  • None of the above 

Electrophiles are:

  • electron loving species            

  • electron hating species

  • nucleus loving reagents            

  • nucleus hating reagents

Nucleophiles are:

  • electron loving

  • electron hating

  • nucleus loving

  • nucleus hating

The increasing order of +ve I-effect shown by H, CH3, C2H5 and C3H7 is-

  • H < CH3 < C2H5 < C3H7

  • H> CH3 <C2H5 > C3H7

  • H < C2H5 < CH3 <C3H7

  • None of the above

To which ring size cycloalkanes, Baeyer’s strain theory is not valid?

  • 3 carbon

  • 4 carbon

  • 5 carbon

  • ≥6 carbon

Shifting of electrons of a multiple bonds under the influence of a reagent is called:

  • I-effect

  • E-effect

  • M-effect

  • T-effect

The correct statement among the following is -

  • Allyl carbocation (CH2=CH-CH2+) is more stable than propyl carbocation

  • Propyl carbocation is more stable than allyl carbocation

  • Both are equally stable

  • None of the above

Sulphur trioxide is:

  • an electrophile             

  • a nucleophile

  • a homolytic agent         

  • a base

The correct order of nucleophilicity among the following is:

(I) CH3COO-

(II) CH3CO-

(III) CN-

(IV) 

  • I > II > III > IV

  • IV > III > II > I

  • II > III > I > IV

  •  III > II > I > IV

The compound which gives the most stable carbocation on dehydration:

  •  CH3-CH-(CH3)- CH2OH           

  •  CH3 -C(CH3)2- OH

  • CH3 - CH2 - CH2 - CH2OH

  •  CH3 -CH(OH)- CH2 - CH3

Allyl isocyanide has:

  • 9 σ, and 4π-bonds.

  • 8 σ, and 5π-bonds

  • 9 σ, and 3π-bonds, 

  • 8 σ, and 3 π bonds

Which of the following acids has the smallest dissociation constant?

  • CH3CHFCOOH

  • FCH2CH2COOH

  • BrCH2CH2COOH

  • CH3CHBrCOOH

Which of the following resonating structures of 1-methoxy-1,3-butadiene is least stable ?

  •  C⊝H2 -CH=CH-CH=O⊕-CH3

  •  CH2=CH-C⊝H-CH=O⊕-CH3

  •  C⊝H2-C⊕H-CH=CH-O-CH3

  •  CH2=CH-C⊝H-C⊕H-O-CH3

The least stable resonance structure among the following is:

  •  

  •  

  •  

  •  

Hyperconjugation involves the overlap of the following orbitals:

  •  σ - σ

  •  σ - p

  • p - p

  •  π - π

the IUPAC name of the compound shown below is:

  • 2-bromo-6-chlorocyclohex-1-ene

  • 6-bromo-6-chlorocyclohexene

  • 3-bromo-1-chlorocyclohex-1-ene

  • 1-bromo-3-chlorocyclohexene

Which of the following structures are superimposable?

(1) 

(2) 

(3) 

(4) 

 

 

 

 

 

  • 1 and 2

  • 2 and 3

  •  1 and 4

  •  1 and 3

The production of an optically active compound from a symmetric molecule without resolution in termed as:

  • Walden inversion

  • partial racemisation

  • asymmetric synthesis

  • partial resolution

Buta-1,3-diene and But-2-yne are:

  • Position isomers

  • Functional isomers

  • Chain isomers

  • Tautomers

The number of different substitution products possible when ethane is allowed to react with Chlorine in sunlight are:

  • 9

  • 6

  • 8

  • 5

In butane, which of the following forms has the lowest energy?

  • Gauche form

  • Eclipsed form

  • Staggered form

  • None of these

The pair of structures given below represent-
  
  • Enantiomers
  • Position isomers
  • Conformers
  • None of the above

In the following carbocations, the most stabile carbocation:

 

  •   RCH2C+H3         

  •  

  •                 

  •   

The number of optical isomers of pent-3-en-2-ol is:

  • 2             

  • 4

  • 8             

  • 16

Which of the following structures permits cis-trans isomerism?

  • X2C=CY2

  • XYC=CZ2

  • X2C=CXY

  • XYC=CXY

A compound contains 2 dissimilar asymmetric carbon atoms. The number of optically active isomers is

  • 2 

  • 3

  • 4

  • 5

The number of geometrical isomers in case of a compound with the structure,

CH3-CH=CH-CH=CH-C2H5 are:

  • Four                 

  • Three

  • Two                 

  • Five

Geometrical isomerism is caused by-

  • restricted rotation around C=C bond

  • the presence of one asymmetric carbon atom

  • the different groups attached to the same functional group

  • none of the above

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Practice Chemistry Quiz Questions and Answers