નીચેના પૈકી કઈ પ્રક્રિયામાં પ્રાપ્ત થતી કાર્બનિક નીપજનું ઉત્કલનબિંદુ સૌથી ઓછું હશે ?

A \(CH _3- CH _2- COOH \xrightarrow[ H _2 O ]{ LiAlH _4}\)
B \(\mathrm{CH_3COCH_3 \xrightarrow[\mathrm{H_2O}]{\mathrm{NaBH_4}} }\)
C \(CH _3- CH _2- CHO \xrightarrow[ H _2 O ]{ NaBH _4}\)
D \(CH _3- CH = CH _2 \xrightarrow[ H _2 O _2 \cdot OH ]{\left( BH _3\right)_2}\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(\mathrm{CH_3COCH_3 \xrightarrow[\mathrm{H_2O}]{\mathrm{NaBH_4}} }\)

Step-by-step Solution

Detailed explanation

A) \[ \mathrm{CH_3CH_2COOH \xrightarrow[\;H_2O\;]{LiAlH_4} CH_3CH_2CH_2OH} \] Product: 1-propanol

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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