Assertion : If the distance between parallel plates of a capacitor is halved and dielectric constant is three times, then the capacitance becomes 6 times.
Reason : Capacitance of the capacitor does not depend upon the nature of the dielectric material.

Assertion is correct but Reason is incorrect.

 The correct answer is option 3: Assertion is correct but Reason is incorrect.

Assertion : If the distance between parallel plates of a capacitor is halved and dielectric constant is three times, then the capacitance becomes 6 times. this is correct.

C = ε_oA/d and C = Kε_oA/d if a material of dielectric constant K is inserted between the plates.

$\frac{C_1}{C_2} = \frac{K_1}{K_2} \frac{d_2}{d_1} = \frac{1}{2} \frac{1}{3} = \frac{1}{6}$

$ C_2 = 6 C_1$

Reason:.Capacitance of the capacitor does not depend upon the nature of the dielectric material.  This is False because capacitance clearly depends on the nature of the dielectric material through the dielectric constant (K).