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Which of the following statements are correct for fractional distillation?
(i) Fractional distillation method is used if the two liquids have sufficiently large difference in their boiling points.
(ii) A fractionating column provides many surfaces for heat exchange between the ascending vapours and the descending condensed liquid.
(iii) Each successive condensation and vaporisation unit in the fractionating column is called a theoretical plate.
(iv) Fractional distillation method is used to separate different fractions of crude oil in petroleum industry.
(a) (i), (ii) and (iv)
(b) (ii), (iii) and (iv)
(c) (i), (ii) and (iii)
(d) (i), (ii), (iii) and (iv)

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