What type of isomerism is pentane, pentene, dichloropentane, and bromochlorofluoromethane?Give me the type of isomerism of each substance listened...

The term "isomer" in organic chemistry, refers to two or
more substances that have the same molecular formula but different structures and
somewhat different physical and/or chemical
properties.

These differences in structure could be due to
how the carbon atoms are connected in the compounds (structural isomers), or due to how
the atoms around a double or triple bond are connected to the carbon atoms
(stereoisomers).

An example of an isomer would be butane
which has the chemical formula of C4H10. The four carbon atoms could be connected in a
straight line to form a linear molecule, or there could be three carbon atoms connected
in a line, with the fourth attached to the middle carbon of the first three. These would
be structural isomers.

The examples you list all have
different molecular formulas:

pentane =
C5H12

pentene =
C5H10

dichloropentane =
C5H10Cl2

bromochlorfluoromethane =
CHBrClF

so none is an isomer of any of the
others.

Now, pentane can have several different structural
isomers such as 2-methyl butane and 2,2 -
dimethylpropane.

Likewise, pentene - which contains one
double bond - can have multiple structural isomers (at least 5) as well as multiple
stereoisomers because of the double bond present in this
compound