The correct sequence of reagents for the above conversion of X to Y is:

Step 1: NaOEt
Reaction name: Elimination (E2 dehydrohalogenation)

• Removes HBr from the side chain
• Forms an alkene (styrene type: Ph-CH=CH₂)

Step 2: B₂H₆ / H₂O₂
Reaction name: Hydroboration-oxidation

• Adds OH in anti-Markovnikov manner
• Converts alkene to primary alcohol (Ph-CH₂-CH₂-OH)

Step 3: Jones reagent (CrO₃ / H⁺)
Reaction name: Oxidation of primary alcohol

• Converts -CH₂OH → -COOH
• Forms Ph-CH₂-COOH