Which of the following technique is most suitable for purification ...

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Which of the following technique is most suitable for purification of cyclohexanone from a mixture
\( \mathrm{P} \)
containing benzoic acid, isoamyl alcohol,
W
cyclohexane and cyclohexanone-
(1) Crystallisation
(2) IR spectroscopy
(3) Sublimation
(4) Gas chromatography
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