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JEE Main Chemistry question

ChemistryOrganic Chemistry - Some Basic Principles and TechniquesJEE Main

How many of the following compounds will be optically active? (1) α-Methoxypropionaldehyde, (2) 3-Hydroxybutanal, (3) 4-Oxopentanal, (4) 2-Methyl-4-oxopentanal, (5) 3-Methoxybutanal.

Answer: 4

Solution

α-Methoxypropionaldehyde, CH₃CH(OCH₃)CHO, has a stereocentre at C2 (OCH₃, CH₃, CHO, H). 3-Hydroxybutanal, CH₃CH(OH)CH₂CHO, has a stereocentre at C3 (OH, CH₃, CH₂CHO, H). 2-Methyl-4-oxopentanal, OHC–CH(CH₃)–CH₂–CO–CH₃, has a stereocentre at

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Question ID VK-150180