TS EAMCET · Chemistry · Hydrocarbons

Assertion (A): Reaction of 1-butene with \(\mathrm{HBr}\) gives 1-bromobutane as major product. Reason (R) Addition of hydrogen halides to alkenes proceeds according to Markownikoff's rule. The correct answer is

A A and R are correct and \(\mathrm{R}\) is the correct explanation of \(A\)
B \(A\) and \(R\) are correct but \(R\) is not the correct explanation of \(A\)
C \(A\) is correct but \(R\) is not correct
D \(\mathrm{A}\) is not correct but \(\mathrm{R}\) is correct

Verified Solution

Answer & Solution

Correct Answer

(D) \(\mathrm{A}\) is not correct but \(\mathrm{R}\) is correct

Step-by-step Solution

Detailed explanation

According to Markownikoff's rule, the addition of reagents such as \(\mathrm{HX}, \mathrm{H}_2 \mathrm{O}\) and \(\mathrm{HOX}\) with unsymmetrical alkanes occurs in such a way that the negative part of the adding molecule goes to that carbon atom of the double bond which…

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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