Question

Will all haloalkanes that have ethane as the parent chain not have numbers in the name? Also, could there be a haloalkane with methane as the parent chain. If so, could you give an example?

Answer 1

no . some haloalkanes enthane as the parent chain in the name have numbers

haloalkanes that have ethane as the parent chain have numbers in the name

example 1 )

suppose C2H4Cl2 is ethane derivative. it can be of two compounds

Cl CH2-CH2-Cl -----------------------> 1,2 -dichloro ethane

CH3-CHCl2 ---------------------------> 1,1- dichloro ethane

example 2 )

C2H3Cl3 can have two compounds

CH3- CHCl3 -------------------> 1,1,1-trichloroethane

Cl CH2 - CHCl2 --------------> 1,1,2-trichloroethane

so finally we can say some halo compounds derived from ethane can have number in parent chain

haloalkane with no numbers in their names :

CH3-CH2 Cl -------------------> chloroethane

CH3-CH2Br---------------------> bromoethane

haloalkane with methane as the parent chain no need of numbers because here only one carbon is present

example :

CH3Cl -------------> chloromethane

CH2Cl2 -------------> dichloromethane

CHCl3---------------> trichloromethane

CCl4----------------> tetrachloromethane