MEDIUMMCQ SINGLEJEE Mains ChemistryOrganic ChemistryAldehydes and ketonesPrevious Year Questions

Name the reagent used to bring about the following transformation : But-2-ene to ethanal (AMU 2010)

A.K2Cr2O7 in acidic medium

B.CrO2Cl2/H3O+

C.PCC

D.O3/H2O–Zn dust✓ Correct

Explanation

The alkenes can be converted into aldehydes and ketones by reacting the given aldehydes and ketones with ozone in the presence of Zn dust and water. So, when the but- 2en is reacted with ozone, there is formation of ozonide, which on reduction with zinc dust and water gives 2 moles of ethanal or acetaldehyde. The reaction is given below:

Back to Question Bank

Practice More Like This

Take chapter-wise tests, track your progress, and master Aldehydes and ketones.

Start Free Practice →