Consider the reaction in which HCl adds across the double bond of ethene: HCl + H 2

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Consider the reaction in which HCl adds across the double bond of ethene:

HCl + H2C = CH2→ H3C—CH2Cl The following mechanism, with the accompanying energy diagram, has been suggested for this reaction:Step 1 Step 2 Energy HCI + HC=CH H3C=CH+ + CI Ea C=C + HCI 11 HC=CH + CI HC-CHCl TAHTxn -Reaction progress.

a. Based on the energy diagram, determine which step is rate limiting.

b. What is the expected order of the reaction based on the proposed mechanism?

c. Is the overall reaction exothermic or endothermic?

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