A mechanism that has been proposed for the conversion of 2-methylpropene to tert

Question

A mechanism that has been proposed for the conversion of 2-methylpropene to tert-butyl alcohol in acidic aqueous solution is: step 1 slow: (CH32C-CH2 H(CH3)3C step 2 fast (CH3)3C H2O (CH3)3COH H (1) What is the equation for the overall reaction? Use the smallest integer coefficients possible. If a box is not needed, leave it blank. 1 (2) Which species acts as a catalyst? Enter formula. If none, leave box blank: (3) Which species acts as a reaction intermediate? Enter formula. If none, leave box blank (4) Complete the rate law for the overall reaction that is consistent with this mechanism. (Use the form k[A][B]., where '1' is understood (so don't write it) for m, n etc.)

Explanation / Answer

Q1

add all

note that H+ = H+ is a catalayst

and C(CH3)3C+ is an itnermediate, do not include them

(CH3)2C=CH2 + H2O = (CH3)3COH + H+

Q2

catalyst is the one which will NOt be consumed and will be recovered eventually

this is H+

Q3

itnermediates are formed then consumed, will not appear in the step

then

(CH3)3C+ is the intermediate

Q4

the rate law depends mainly on the SLOW step so

Rate = k*[(CH3)3C=CH2][H+]

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