WBJEE · Chemistry · Haloalkanes and Haloarenes

2-methylpropane on monochlorination under photochemical condition give

A 2 -chloro-2-methyipropane as major product
B \((1: 1)\) mixture of 1 -chioro- 2 -methylpropane and 2 -chloro-2-methylpropane
C 1-chioro-2-methylpropane as a major product
D \((1: 9)\) mixture of 1 -chioro- 2 -methylpropane and 2-chloro-2-methylpropane

Verified Solution

Answer & Solution

Correct Answer

(C) 1-chioro-2-methylpropane as a major product

Step-by-step Solution

Detailed explanation

There are nine primary hydrogens and one tertiary hydrogen in 2 -methyl propane. Tertiary hydrogen atoms react with Cl about 5.5 times as fast as primary. Even though the primary hydrogens are less reactive, there are so many of them that the primary product is the major product.

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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