Question

write structural formulas for all the constitutional isomers of molecular formula c3h6o that contain (a) only single bonds (b) one double bond

Answer 1

Constitutional isomers of C3H6O with only single bonds include both primary and secondary propanol. Isomers with one double bond include propionaldehyde (an aldehyde) and acetone (a ketone). There are no cis-trans isomers for C3H6O due to the lack of geometric isomerism in these molecules.

Step-by-step explanation:

The question asks us to write structural formulas for all the constitutional isomers of the molecular formula C3H6O that contain only single bonds (saturates) and those with one double bond (unsaturates). Let's tackle each part:

(a) Isomers with only single bonds

There is only one isomer that contains only single bonds, which is propanol. It can exist as either primary propanol (1-propanol) or secondary propanol (2-propanol/isopropanol). Since these species have only single bonds, no other isomer exists for C3H6O with only single bonds.

(b) Isomers with one double bond

For those containing one double bond, the possibilities include aldehydes and ketones. The aldehyde variant would be propionaldehyde with the structure CH3-CH2-CHO. The ketone variant would be acetone with the structure CH3-CO-CH3.

Molecules must have a double bond to be cis-trans isomers, but since the compounds with formula C3H6O have no geometric isomerism due to double bonds, this type of isomerism is not applicable here.