Question

A compound is formed by the substitution of two chlorine atoms for two hydrogen atoms in propane. Write the structures of the isomers possible. Give the IUPAC name of the isomer which can exhibit enantiomerism.

Answer 1

1)CH3CH2CHCL2
2)CH3CHCLCH2CL
3) CH3CCLCH3
further including stereovsomers,total no of isomers become 10 .
If you need to add the dichloroderivative of isobutane (Me3CH) as well , the you must add this also
1) CH(CL2) - CH(CH3)
2) CH3(1,1- dichloro -2- methypropane

Answer 2

Chloropropane is formed by the substitution of two chrome atoms for two hydrogen atoms in propane.

Chemical equation of reactions is CH₃CH₂CH₃ + Cl₂ ——> CH₃CH(Cl)-CH-Cl or , CH₂Cl-CH₂-CH₂Cl or , CH₃CH₂CHCl₂ or, CH₃C(Cl₂)CH₃

Hence, there are four structural isomers are possible which are CH₃CH(Cl)-CH-Cl , CH₂Cl-CH₂-CH₂Cl , CH₃CH₂CHCl₂ , CH₃C(Cl₂)CH₃

The above isomers will exhibit enantiomerism :

CH₃-CH(Cl)-CH₂Cl ,IUPAC name : 1,2-Dichloropropane.