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Which of the given statements is not true for the following reaction?
\[
\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right]^{2+}+4 \mathrm{NH}_{3} \rightleftharpoons\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}+4 \mathrm{H}_{2} \mathrm{O}
\]
(A) It is a ligand-substitution reaction.
(B) \( \mathrm{NH}_{3} \) is a relatively strong-field ligand while \( \mathrm{H}_{2} \mathrm{O} \) is a weak-field ligand.
(C) During the reaction, there is a change in colour from light blue to dark blue.
(D) \( \left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+} \) has a tetrahedral structure, and is paramagnetic.
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