Which reaction pathway has the larger rate constant. Which pathway has acetone a

Question

Which reaction pathway has the larger rate constant. Which pathway has acetone added.

2. The rate constant value is inversely related to the activation energy of a reaction (A faster reaction will have a smaller activation energy). The energy diagram at right shows pathways for today's Syl reaction before and after addition of acetone. (3pts) a. Which reaction pathway has the larger rate constant: A or B? Which pathway corresponds to the reaction after the addition of acetone: A or B ? b. c. Draw the structure of the organic molecule present at C on the diagram.

Explanation / Answer

A) The more the activation energy, lesser is the rate of the reaction.

Sn1 reraction diagram exhibits two humps, in which first hump is for the representation of the Transition state (rate determining step) which requires activation energy.

from the diagram, Activation energy for pathway A > Activation energy for pathway B

So rate constant of pathway B > rate constant of pathway A.

B) Acetone is a polar aprotic solvent.

As we know, rate of the SN1 reaction increses in polar protic solvent and decreses in polor aprotic solvent (like Acetone).

So Pathway A is the "After acetone" pathway because its rate is less.

and Pathway B is the "before acetone" pathway because its rate is more.

C) Will be a carbocation intermediate.

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