Give the number of structural isomers for methane,ethane,propane,butane,pentane,hexane,heptane,and decane.

(N/A) Methane $(CH_{4})$,ethane $(C_{2}H_{6})$,and propane $(C_{3}H_{8})$ do not exhibit structural isomerism as they have only one possible structure.

Name of Hydrocarbon	Number of Isomers
Butane $(C_{4}H_{10})$	$2$
Pentane $(C_{5}H_{12})$	$3$
Hexane $(C_{6}H_{14})$	$5$
Heptane $(C_{7}H_{16})$	$9$
Decane $(C_{10}H_{22})$	$75$