NEET · Chemistry · STD 12 -8.1. Aldehydes and ketones

Given below are two statements: Statement \(I:\) The boiling points of aldehydes and ketones are higher than hydrocarbons of comparable molecular masses because of weak molecular association in aldehydes and ketones due to dipole - dipole interactions. Statement \(II:\) The boiling points of aldehydes and ketones are lower than the alcohols of similar molecular masses due to the absence of \(H\)-bonding. In the light of the above statements, choose the most appropriate answer from the options given below :

A Both Statement \(I\) and Statement \(II\) are incorrect.
B Statement \(I\) is correct but Statement \(II\) is incorrect.
C Statement \(I\) is incorrect but Statement \(II\) is correct.
D Both Statement \(I\) and Statement \(II\) are correct.

Verified Solution

Answer & Solution

Correct Answer

(D) Both Statement \(I\) and Statement \(II\) are correct.

Step-by-step Solution

Detailed explanation

Boiling point of comparable molecular mass molecules \(R - OH \,>\,\,\,\,\,\,\,\,\,\,\,\) Aldehyde - Ketone \(\,>\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\) Alkane

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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