Which of the statements are correct about the above reaction?
1.  (a) and (e) both are nucleophiles.
2.  In (c) carbon atom is sp3 hybridized.
3.  In (c) carbon atom is sp2 hybridized.
4.  (a) and (e) both are electrophiles.

(i, iii)
In the above reaction H- and Cl- both will ac as electron rich moities because of presence of negative charge, Hence react as a nucleophiles.

The Mechanism of above reaction is SN2 mechanism having halogen atom at sp3 hybridised carbon. In this mechanism, the hetrolytic cleavage of C—Cl bond occur and formation of new bond in concerted manner via transition state formation. In transition state carbon atom is approximately sp2 hybridised.