Q 1 :    

Number of alkanes obtained on electrolysis of a mixture of CH3COONa and C2H5COONa is _________ .                  [2024]



(3)

     Kolbe's electrolysis of RCOO-Na+ gives R-R

     2RCOONa+2H2OelectrolysisR-R+2CO2+2NaOH+H2

     Thus electrolysis of mixture of CH3COONa and C2H5COONa gives three alkanes: CH3-CH3, C2H5-C2H5 and CH3-C2H5

 



Q 2 :    

The incorrect statement regarding conformations of ethane is:                          [2024]

  • Ethane has infinite number of conformations.

     

  • The dihedral angle in staggered conformation is 60°.

     

  • Eclipsed conformation is the most stable conformation.

     

  • The conformations of ethane are inter-convertible to one-another.

     

(3)

 



Q 3 :    

3-Methylhex-2-ene on reaction with HBr in presence of peroxide forms an addition product (A). The number of possible stereoisomers for ‘A’ is ______.           [2024]



(4)

Major product (A) has two chiral centres and from mechanism of this reaction it is clear that both R and S configurations are possible at both these chiral centres. Hence A has 22=4 stereoisomers.