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Topic Question Set

Q 1 :

Highest enol content will be shown by:                              [2024]

  •  

  •  

  •  

  •  

(4)

More is acidic strength of acidic hydrogen in ketone, more is the percent enol content. In (3) and (4), there is active methylene group hence acidic strength of enolisable H is more as compared to (1) and (2). In (4), because of −I effect of carbonyl group, acidic strength of H of active methylene group is more as compared to that in (3). Hence (4) has highest percent enol content.

 

Q 2 :

Given below are four compounds :
a) n-propyl chloride    b) iso-propyl chloride
c) sec-butyl chloride     d) neo-pentyl chloride

Percentage of carbon in the one which exhibits optical isomerism is :       [2026]

  • 56

     

  • 52

     

  • 40

     

  • 46

     

(2)

 2-Chlorobutane is optically active and chiral molecule

Molecular formula⇒C4H9Cl

Molar mass=48+9+35.5=92.5

%OC=4892.5×100=51.89%

Q 3 :

Compound which can exhibit stable keto enol tautomerism

  •  

  •  

  •  

  •  

(4)

Q 4 :

Given below are two statements:

Statement I: 2,6-diethylcyclohexanone and 6-methyl-2-n-propylcyclohexanone are metamers.

Statement II: 2,2,6,6-tetramethylcyclohexanone exhibits keto-enol tautomerism.

In the light of the above statements, choose the correct answer from the options given below:           [2026]

  • Both Statement I and Statement II are true

     

  • Both Statement I and Statement II are false

     

  • Statement I is true but Statement II is false

     

  • Statement I is false but Statement II is true

     

(3)

Statement I:

[IMAGE 170]

Isomers with different alkyl group around polyvalent functional group are metamers. Hence these two are metamers.

Statement II: There is no α-H in 2,2,6,6-Tetramethylcyclohexanone. Hence it does not show tautomerism.

[IMAGE 171]