$$\ce{CH2=CH-CH=CH2 ->[\ce{H2/Pt}][\pu{1 equiv}] ?}$$
I thought $$\ce{H2}$$ should add to one of the π bonds and form but-1-ene. But the answer is but-2-ene.
• Just read about $1,2$-addition vs. $1,4$-addition. – Soumik Das May 22 at 6:35