Question

An organic compound having the molecular formula C2H60 can exist in the form of two isomers A and B having different functional groups. The isomer A is a liquid which is used as a solvent for nail polish. The isomer B is also a liquid. An aqueous solution of one of the lower homologues of B is used for preserving biological specimens in the laboratory
(a) What is compound A ?
(b) Write the electron-dot structure of A.
(c) What is compound B ?
(d) Write the electron-dot structure of B.
(e) Name the lower homologue of compound B which is used in preserving biological specimens.

Lakhmir Singh Chemistry Class 10

Answer 1

Answer:

a) Isomer A, which is used as a nailpolish remover is Propanone. This has a functional group C=O and belongs to the homologous series of Ketone.

b) Propanone's electron dot structure is:

     H   O   H

     ×   • •   ×

      •   • •   •        

HוC••C••C•×H

      •          •

      ×         ×

      H        H

c) Isomer B, which is a liquid is Propanal. It has a functional group CHO, and belongs to the homologous series of aldehydes.

d) Propanal's electron dot structure is:

     H  H   O  

     ×    ×   • •  

      •    •   • •        

HוC••C••C•×H

      •    •

      ×   ×

      H  H

e) The lower homologue compound of B used for preservation of Biological specimen is Methanal which is also an aldehyde.