TS EAMCET · Chemistry · Hydrocarbons

The correct order of rates of addition of ${Br}_{2} /$ water to the following alkenes is [A] ${CH}_{2} = {CH}_{2}$ [B] ${CH}_{2} = CH - {NO}_{2}$ [C] ${CH}_{3} - {CH}_{2} - CH = {CH}_{2}$ [D] ${CH}_{3} - \overset{\underset{|}{{CH}_{3}}}{CH} = {CH}_{2}$

A $[D] > [C] > [A] > [B]$
B $[D] > [C] > [B] > [A]$
C $[A] > [B] > [C] > [D]$
D $[A] > [B] > [D] > [C]$

Verified Solution

Answer & Solution

Correct Answer

(A) $[D] > [C] > [A] > [B]$

Step-by-step Solution

Detailed explanation

Addition of Br2/ water to the alkene is example of electrophilic addition reaction. This reaction take place in two steps. In first step electrophile is added to the alkene and intermediate carbocation is formed. This step is also called rate determining step. So, reactivity of…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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The correct order of rates of addition of Br2/water to the following alkenes is [A] CH2=CH2 [B] CH2=CH-NO2 [C] CH3-CH2-CH=CH2 [D] CH3-CHCH3|=CH2

Step-by-step Solution

The correct order of rates of addition of ${Br}_{2} /$ water to the following alkenes is [A] ${CH}_{2} = {CH}_{2}$ [B] ${CH}_{2} = CH - {NO}_{2}$ [C] ${CH}_{3} - {CH}_{2} - CH = {CH}_{2}$ [D] ${CH}_{3} - \overset{\underset{|}{{CH}_{3}}}{CH} = {CH}_{2}$