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AP EAMCET202023 Sep 2020Morning ShiftChemistryChemical KineticsActual

Increasing order of boiling points in the following compounds is: CH 3 COOH ( i )       CH 3 CH 2 CHO ( ii )       CH 3 CH 2 CH 2 OH ( iii )       CH 3 COCH 3 ( iv )

Options

  1. A( ii ) < ( i   v ) < ( i   i   i ) < ( i )
  2. B( ii ) < ( i   v ) > ( i   i   i ) < ( i )
  3. C( iv ) < ( ii )   > ( i )   < ( iii )
  4. D( iv ) < ( iii ) < ( ii ) < ( i )

Correct answer

A. ( ii ) < ( i   v ) < ( i   i   i ) < ( i )

Step-by-step solution

The boiling point of the compound depends on Van der Waal's force of attraction like dipole-dipole attractions, H-bonding etc. Among the given molecules acetic acid and propyl alcohol are having hydrogen bonding attraction force and the force of attraction is stronger in case of acetic acid. Among the acetone and propanal, propanal has less boiling point due to weak Van der waal's force of attraction.

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