The major product X is the alkene, and the major product Y is the alcohol.
The reaction is a hydration reaction, which is a reaction between an alkene and water to form an alcohol. The mechanism of the reaction involves the formation of a carbocation intermediate, which then reacts with water to form the alcohol.
The alkene in this reaction is 2-butene, and the water molecule is the nucleophile. The carbocation intermediate is formed by the protonation of the alkene, which occurs at the carbon atom with the least number of hydrogen atoms. The carbocation intermediate is then attacked by the water molecule, which forms the alcohol.
The major product X is the alkene because the carbocation intermediate is more stable when it is in conjugation with the double bond. The double bond stabilizes the carbocation by resonance, which makes it less likely to react with water.
The major product Y is the alcohol because the carbocation intermediate is more stable when it is in a tetrahedral geometry. The tetrahedral geometry is formed when the water molecule attacks the carbocation intermediate, which makes it less likely to react with other nucleophiles.
The other options are incorrect because they do not represent the major products of the reaction.