The question asks for the order of two reactions (I) and (II), but the actual reaction schemes are not visible in the prompt. In haloalkanes/haloarenes, such questions almost always compare:

1. an $S_N1$ reaction → first-order kinetics, and
2. an $S_N2$ reaction → second-order kinetics.

So let us use the standard kinetic facts.

1. Rate law for an $S_N1$ reaction

In an $S_N1$ reaction, the slow step is the ionization of the substrate:

$R-X \longrightarrow R^+ + X^-$

Since only the concentration of the haloalkane appears in the rate-determining step,

$\text{Rate} = k[R-X]$

Hence, the reaction is first order.

2. Rate law for an $S_N2$ reaction

In an $S_N2$ reaction, the nucleophile attacks the substrate in a single concerted step:

$R-X + Nu^- \longrightarrow R-Nu + X^-$

So the rate depends on both reactants:

$\text{Rate} = k[R-X][Nu^-]$

Hence, the reaction is second order.

3. Matching with the options

Thus, if reaction (I) is the $S_N1$ type and reaction (II) is the $S_N2$ type, then:

• Reaction (I): 1st order
• Reaction (II): 2nd order

This corresponds to:

$\boxed{\text{Option A}}$

4. Comparison with stored answer

Stored correct answer = A
Derived answer = A

So they agree.