The order of reaction will be if the value of rate constant is 7.195…

The correct answer is Option (4) → 4

For a reaction of order n, rate = k[A]ⁿ, so

    \( k = \displaystyle\frac{\text{rate}}{[A]^n} = \displaystyle\frac{\text{mol L}^{-1}\,\text{s}^{-1}}{(\text{mol L}^{-1})^n} = (\text{mol L}^{-1})^{1-n}\,\text{s}^{-1} = \text{mol}^{1-n}\,\text{L}^{n-1}\,\text{s}^{-1} \)

Zero order: mol L⁻¹ s⁻¹; first order: s⁻¹; second order: mol⁻¹ L s⁻¹; third order: mol⁻² L² s⁻¹.

The given unit is mol⁻³ L³ s⁻¹:
1 − n = −3 ⇒ n = 4 (check: Lⁿ⁻¹ = L³)

So the reaction is of fourth order.

NCERT (2026-27 edition):
Units of Rate Constant – …