KCET · Chemistry · Chemical Bonding and Molecular Structure

The arrangement of following compounds :
i. bromomethane
ii. bromofonn
iii. chloromethane
iv. dibromomethane
In the increasing order of their boiling point is

A iii \( < i < i v < i \)
B iv \( < \mathrm{iii} < \mathrm{i} < \mathrm{i} \)
C \( \mathrm{ii} < \mathrm{iii} < \mathrm{i} < \mathrm{iv} \)
D \( \mathrm{i} < \mathrm{ii} < \mathrm{iii} < \mathrm{iv} \)

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Answer & Solution

Correct Answer

(A) iii \( < i < i v < i \)

Step-by-step Solution

Detailed explanation

The intermolecular forces of attraction become stronger with the increase in size of the molecules. Hence, the order of
boiling points will be
\( \mathrm{CH}_{3} \mathrm{Cl} < \mathrm{CH}_{3} \mathrm{Br} < \mathrm{CH}_{3} \mathrm{Br}_{2} < \mathrm{CH} \mathrm{Br}_{3} \)

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 arrangement of following compounds :i. bromomethaneii. bromofonniii. chloromethaneiv. dibromomethaneIn the increasing order of their boiling point is

Step-by-step Solution

The arrangement of following compounds :
i. bromomethane
ii. bromofonn
iii. chloromethane
iv. dibromomethane
In the increasing order of their boiling point is