JEE Main Chemistry question
How many σ-bonds are present in the enolic form of acetaldehyde, CH₂=CH–OH (vinyl alcohol)?
Answer: 6
Solution
2 (terminal =CH₂ C–H bonds) + 1 (the C=C σ-component) + 1 (the internal =CH–'s C–H) + 1 (C–O) + 1 (O–H) = 6.