Chemistry
Practise Hydrocarbons, Chemical Kinetics, Electrochemistry, and p-Block Elements with AI-powered explanations.
Why option 1 is correct
The aldehyde carbon is carbon 1. The four-carbon chain has its double bond between carbons 2 and 3, so the preferred IUPAC name is but-2-enal.
but-2-enal, carbons numbered from the aldehyde
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SN2: the nucleophile in, the leaving group out
Annotated arrow-pushing diagrams for SN1, SN2, elimination, and addition reactions
NCERT · Organic Chemistry – Some Basic Principles
The aldehyde carbon is carbon 1, so the double bond sits between carbons 2 and 3.
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Some Basic Concepts of Chemistry