Question:medium

Arrange the following rate constant units in increasing order of their order of reaction:(A) sec-1
(B) mol L-1 sec-1
(C) mol-1 L sec-1
(D) mol-1 L2 sec-1
Choose the correct answer from the options given below:

Updated On: Mar 27, 2026
  • (C) < (A) < (B) < (D)
  • (C) < (B) < (A) < (D)
  • (B) < (A) < (C) < (D)
  • (A) < (B) < (C) < (D)
Show Solution

The Correct Option is A

Solution and Explanation

Reaction order is determined by the units of the rate constant. The general formula is: Units of rate constant = (mol L-1)1-n sec-1, where 'n' represents the order of the reaction. The order is calculated for each option as follows:

  • (A) Units: sec-1
    Order: 1 (n=1) - First-order reaction.
  • (B) Units: mol L-1 sec-1
    Order: 0 (n=0) - Zero-order reaction.
  • (C) Units: mol-1 L sec-1
    Order: 2 (n=2) - Second-order reaction.
  • (D) Units: mol-1 L2 sec-1
    Order: 3 (n=3) - Third-order reaction.

Arranging the orders in increasing magnitude:
(B) 0-order < (A) 1st-order < (C) 2nd-order < (D) 3rd-order.
Therefore, the correct arrangement of rate constant units in increasing order is (B) < (A) < (C) < (D).

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