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MHT CET202620 April 2026Evening ShiftChemistryHydrocarbonsActual

Which of the following reaction steps is known as propagation step

Options

  1. ACl-Cl Cl ^ + Cl ^
  2. BCH ₃ + Cl ₂ CH ₃ -Cl + Cl ^
  3. CCH ₃^ + Cl ^ CH ₃ -Cl
  4. DCH ₃^ + CH ₃^ CH ₃ -CH ₃

Correct answer

B. CH ₃ + Cl ₂ CH ₃ -Cl + Cl ^

Step-by-step solution

In a free radical substitution reaction, the mechanism involves three types of steps: 1. Initiation step: A neutral molecule breaks down to form free radicals. Cl-Cl Cl ^ + Cl ^ 2. Propagation step: A free radical reacts with a neutral molecule to generate a new free radical and a new neutral molecule. This step keeps the chain reaction going. CH ₃^ + Cl ₂ CH ₃ -Cl + Cl ^ 3. Termination step: Two free radicals combine to form a neutral molecule, stopping the chain reaction. CH ₃^ + Cl ^ CH ₃ -Cl CH ₃^ + CH ₃^ CH ₃

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