Answer:
(3S)-2-chloro-2,3-dimethylpentane is produced exclusively.
Step-by-step explanation:
Electrophilic addition to (3S)-2,3-dimethylpent-1-ene proceeds through a carbocationic intermediate.
In the first step,
adds onto double bond to produce more stable tertiary carbocation. (protonation)
In the second step,
adds onto carbocation to produce (3S)-2-chloro-2,3-dimethylpentane exclusively.(nucleophilic addition)
So, option (d) is correct.