The number of structure isomers of C6H14 is:
5
C6H14
⇒CH3−CH2−CH2−CH2−CH2−CH3 ..................(1)
CH3−CH2−CH2−CH3|CH−CH3 .................(2)
CH3−CH2−CH3|CH−CH2−CH3 .................(3)
CH3−CH2−CH3|C|CH3−CH3 .................(4)
CH3−CH2−CH2−CH3|C|CH3−H .................(5)