Which of the following an inorganic compound?

CH3 (CH2) 3CH3 pentane

C6H12O6 glucose

C4H10 butane

H2O water molecule

An organic compound is one which consists of a chain of carbon atoms with other atoms bonded to the chain.

Pentane has 5 carbon atoms with surrounding hydrogens.

glucose is a chain of 6 carbon atoms

butane is similar to pentane

water has no carbon atoms, and the central atom is oxygen - - - > therefore it is inorganic!