Acetaldehyde on treatment with a few drops of concentrated $\ce{H2SO4}$ gives?
Attempt:
First, I formed an enol intermediate in acidic medium $\ce{CH2=CHOH}$. Then, I performed electrophilic addition of another acetaldehyde molecule on this enol intermediate to get $\ce{CH3CH(OH)CH2CHO}$.
But answer given in my book is:
Please let me know the error in my attempt.