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Which of the following statements are correct?
(i) In Sandmeyer reaction nucleophiles like \( \mathrm{Cl}^{-}, \mathrm{Br}^{-} \)and \( \mathrm{CN}^{-} \)are indroduced in benzene ring in the presence of \( \mathrm{Cu}^{+} \)ion
(ii) In Gattermann reaction nucleophiles are introduced in benzene ring in the presence of copper powder and \( \mathrm{HCl} \).
(iii) The yield in Gattermann reaction is found to be better than Sandmayer reaction.
(a) (i) and (ii)
(b) (i), (ii) and (iii)
(c) (ii) and (iii)
(d) (i) and (iii)
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