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JEE Main levelSingle correct optionDifficulty 2 of 3si084

A mixture is placed on a silica gel column and eluted with hexane. Among octane, octan-1-ol, octanoic acid and octanamide, the first to emerge from the column is

  1. Aoctan-1-ol
  2. Boctane
  3. Coctanoic acid
  4. Doctanamide

Answer: B

Silica gel is polar and holds polar compounds strongly. The non-polar alkane octane is held least and is carried out first by non-polar hexane.
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