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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%