Which of the following is now used for bleaching of paper, in place...

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Which of the following is now used for bleaching of paper, in place of chlorine?
(a) \( \mathrm{H}_{2} \mathrm{O}_{2} \)
(b) \( \mathrm{CH}_{2}=\mathrm{CH}_{2} \) (c) \( \mathrm{CH}_{3} \mathrm{CHO} \)
(d) \( \mathrm{Cl}_{2} \mathrm{C}=\mathrm{CCl}_{2} \)
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