The reagent used for the conversion of allyl alcohol to propenal is

The reagent used for the conversion of allyl alcohol to propenal is
  1. $\mathrm{O}_3 / \mathrm{H}_2 \mathrm{O}-\mathrm{Zn}$ dust
  2. DIBAL - H
  3. $\mathrm{CrO}_2 \mathrm{Cl}_2 / \mathrm{H}_3 \mathrm{O}^{+}$
  4. $\mathrm{C}_5 \mathrm{H}_5 \mathrm{NH}^{+} \mathrm{CrO}_3 \mathrm{Cl}^{-}$

Asked in: AP EAMCET 2018 (23 Apr Shift 1)

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