Bromine addition and hydration of unsaturated hydrocarbons

Steps:

• Recognize C4H8 as a diene with two double bonds, allowing addition reactions.
• Calculate bromine addition: each double bond adds one Br2 molecule, so two Br2 total for complete saturation.
• For the second reaction, alkenes/dioles undergo acid-catalyzed hydration with water.
• Product of hydration is an alcohol via Markovnikov addition.

Why C is correct:

• Diene C4H8 adds two Br2 across conjugated double bonds (general formula for addition: alkene + n Br2 → polybromide, where n=number of double bonds); hydration yields alcohol (RC=CR' + H2O → RCH(OH)CHR').

Why the others are wrong:

• A: Incorrectly states one Br2; diene requires two for full addition.
• B: Incorrect Br2 count and product; oxidation (not hydration) forms carboxylic acid.
• D: Correct Br2 count but wrong product; hydration forms alcohol, not carboxylic acid.

Final answer: C