Classify the following reactions in one of the reaction type studied in this unit.
(a) `CH_(3)CH_(2)Br+HS^(-)toCH_(3)CH_(2)SH+Br^(-)`
(b) `(CH_(3))_(2)C=CH_(2)+HCl to(CH_(3))_(2)ClC-CH_(3)`
(c) `CH_(3)CH_(2)Br+HO^(-)toCH_(2)=CH_(2)+H_(2)O+ Br^(-)`
(d) `(CH_(3))_(3)C-CH_(2)OH+HBrto(CH_(3))_(2)CBrCH_(2)CH_(2)CH_(3)+H_(2)O`

Explanation

(a) Nucleophilic substitution
(b) Electrophilic addition
(c) Bimolecular elimination
(d) Nucleophilic subtitution with rearrangement.