Cyclopentane is NOT an isomer of pentane.
Isomers must have the same molecular formula.
The molecular formula of pentane is C₅H₁₂, while the molecular formula of cyclopentane is C₅H₁₀.
The two molecules cannot be isomers.
Acquired because you don't inherit a "cut off" finger. You do it yourself.....if your clumsy enough
pH(D) A compound that increases the hydroxide ions (OH-) when it is dissolved in a solution