What is the correct difference between first and second order reactions?

What is the correct difference between first and second order reactions?
  1. A first-order reaction can be catalyzed; a second-order reaction cannot be catalyzed.
  2. The half-life of a first-order reaction does not depend on A0; the half-life of a second-order reaction does depend on A0.
  3. The rate of a first-order reaction does not depend on reactant concentrations; the rate of a second-order reaction does depend on reactant concentrations.
  4. The rate of a first-order reaction does depend on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations.

Solution

⇒ (t12)∝(Initial concentration)1−order of Reactiont12  for 1st order = Independent of Concentration
t12for 2nd order ∝1A0
⇒ Rate of first order reaction ∝(A0)1
Rate of second order reaction ∝(A0)2 rate of first order reaction and second order reaction depends on initial concentration.

Asked in: NEET 2018

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