a) the least electronegative is H, followed by I, Br and Cl.
b) (put the arrow that is indicated in your question since I can't draw it perfectly here, but I can indicated the direction of the arrow)
(+) H ----> I (-)
(+) H ----> Br (-)
(+) H ----> Cl (-)
c) since Cl is more electronegative - the molecule HCl is more polar (plus dipole moment data indicate so), followed by HBr and then HI (the least polar).
where you get br in part b
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