Ohm is unit of all of the following except

Inductive reactance
Capacitive reactance
Resistance
Capacitance

The correct answer is D. Capacitance.

Ohm is the unit of electrical resistance. It is denoted by the Greek letter omega (Ω). The resistance of an electrical conductor is the ratio of the voltage across it to the current through it. The higher the resistance, the lower the current.

Inductive reactance is the opposition to the flow of alternating current (AC) in a circuit that is caused by the inductance of the circuit. The inductance of a circuit is the property of a conductor that opposes changes in current. The higher the inductance, the higher the inductive reactance.

Capacitive reactance is the opposition to the flow of alternating current (AC) in a circuit that is caused by the capacitance of the circuit. The capacitance of a circuit is the property of a conductor that stores electrical charge. The higher the capacitance, the higher the capacitive reactance.

Resistance, inductive reactance, and capacitive reactance are all measured in ohms. Capacitance is not measured in ohms.