Correct Answer  Option 3 : 5.4 × 10
19C
CONCEPT:
Electric charge:
 It is an intrinsic property of the elementary particles of matter which gives rise to electric force between various objects.
 It is a scalar quantity.

SI unit of electric charge is coulomb (C).
Quantisation of charge:
 The experimental fact that electric charges occur in discrete amounts instead of continuous amounts is called quantization of charge.
 All free charges are integral multiples of a basic unit of charge denoted by 'e'.
 Thus, the possible charge on a body is given by
⇒ q = ne
Where n is an integer e = 1.6 × 1019C
CALCULATION:
\(n=\frac{q}{e}\)
Option 1:
q = 3.2 × 1019 C
\(n=\frac{3.2\times 10^{19}}{1.6\times 10^{19}}=2\), n is an integer
Option 2:
q = 6.4 × 1019C
\(n=\frac{6.4\times 10^{19}}{1.6\times 10^{19}}=4\) , n is an integer
Option 3:
q = 5.4 × 1019C
\(n=\frac{5.4\times 10^{19}}{1.6\times 10^{19}}=3.375\) , n is not an integer
Option 4:
q = 4.8 × 1019C
\(n=\frac{4.8\times 10^{19}}{1.6\times 10^{19}}=3\), n is an integer
 Therefore, the charge is not quantized, which means 5.4 × 1019C cannot exist in nature.

Hence option 3 is correct