In the following reaction 

carbonyl\:\:compound +MeOH     acetal

Rate of the reaction is the highest for :

  • Option 1)

     Acetone as substrate and methanol in excess

  • Option 2)

    Propanol as substrate and methanol in stoichiometric amount

  • Option 3)

    Propanol as substrate and  methanol in excess

  • Option 4)

    Acetone as substrate and methanol in stoichiometric amount

Answers (1)

 

 

Addition of aldehydes with alcohols -

Produces an unstable hemiacetal intermediate, which further produces acetal (gem - di alkoxy compounds)

- wherein

 

 

 

Addition of ketones with alcohols -

Produces an unstable hemiketal intermediate and further stable compound called ketal.

- wherein