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MHT CET202618 April 2026Morning ShiftChemistryChemical KineticsActual

Which of the following reactions has of overall order 1.5 ?

Options

  1. A2 H ₂ O _ 2(g) 2 H ₂ O _ ( ) + O _ 2(g)
  2. BH _ 2(g) + I _ 2(g) 2 HI _ (g)
  3. CCH ₃ CHO _ (g) CH _ 4(g) + CO _ (g)
  4. D2 NO _ (g) + 2 H _ 2(g) N _ 2(g) + 2 H ₂ O _ ( )

Correct answer

C. CH ₃ CHO _ (g) CH _ 4(g) + CO _ (g)

Step-by-step solution

The thermal decomposition of acetaldehyde is a well-known example of a reaction with a fractional order. The reaction is: CH ₃ CHO _ (g) CH _ 4(g) + CO _ (g) The experimentally determined rate law for this reaction is: Rate = k[ CH ₃ CHO ]^ 1.5 Thus, the overall order of the reaction is 1.5 . For the other reactions: H _ 2(g) + I _ 2(g) 2 HI _ (g) follows second-order kinetics. 2 H ₂ O _ 2(g) 2 H ₂ O _ ( ) + O _ 2(g) follows first-order kinetics. 2 NO _ (g) + 2 H _ 2(g) N _ 2(g) + 2 H ₂ O _ ( ) follows third-order

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