The correct option is B Reaction of NaCl with conc. H2SO4
(A) Electrolysis of brine (aqueous solution of NaCl) yields Cl2 (at anode), H2 (at cathode ) and NaOH solution.
(B) Reaction of NaCl with conc.H2SO4 is represented as-
2NaCl+H2SO4→Na2SO4+HCl
(C) Reaction of NaBr with conc. H2SO4
NaBr+H2SO4→NaHSO4+HBr
H2SO4+2HBr→SO2+Br2+2H2O
(D) NaI and NaIO3 mixed in dil. H2SO4
5NaI+NaIO3+3H2SO4→3Na2SO4+3I2+3H2O