Note the energy diagrams A E are to be used only for part e The conversion of a

Question

Note the energy diagrams A E are to be used only for part e The conversion of a tertiaryalcohol to a tertiary alkyl halide is proposed to proceed through 3 steps a) Which step of the 3 (step 1, step 2 or step 3) coresponds to a Lewis acid basereaction, but not a Bronsted acid base reaction? b) Whichstep of the 3 (step 1, step 2 or step 3) cocresponds to the attack of the muclophile? Which step of the 3 (step 1, step 2 or step 3) coresponds to the unimolecular step? d) Whichstep of the 3 (step 1, step 2 or step 3) cocresponds to a Eronsedacid base reaction? e Selec the diagram below which depicts the most likely energy profile for the 3-sep mechanism when tert-butyl alcohol reacts with HCl atroom emperature react tion progression coordinate a) step 1 step 2 step 3 b) step 1 step 2 step 3

Explanation / Answer

a) in a lewis acid base reaction the lewis base donate an electron pair to the lewis acid.in this the loe pair is accepted by the lewis acid. in the graph if we plot the energy diagram then we can see this that the plot will be a gradual rise and increase in the step-2.

b) it will be take place in the step 3. it is because in the first step the breaking of the bond takes place and as a result of which the lone pair of electrons will be transfer from the one base pair to the acid pair in step 2 and loss H2O. thus nucliophile after that in the step-3.

c) the answer for this step is step-1. in this step the molecules is at the initiate level of the conversion thus it is a step of the unimolecular step. this is the step before which the molecule is not in reactive thus it will be a single entity.

d) according to the bronstad acid base reaction when the acid dissolved in the water, the acid donate a proton to the water to form a new acid which is termed as conjugate acid and the corresponding base is the corresponding base. in this recation the above step will be take place in step-3.

e) the graph B is the correct option as according to this the reaction takes place gradually at the beginning and thus have a high slop in the initial state and then it .

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