Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Reaction Mechanisms Substitution · Exam: NET DEC 2014 · Marks: 2 · Difficulty: Medium
Base hydrolysis of $\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+}$ is an overall second order reaction, whereas that of $[\mathrm{Co}(\mathrm{CN})]^{3-}$ is of first order. The rates depend in both cases solely on the concentrations of the cobalt complex. This may be due to(A) Presence of ionizable proton in $\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+}$ but not in $\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$(B) $\mathrm{S_{N}}1_{\mathrm{CB}}$ mechanism in the case of $\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+}$ only(C) $\mathrm{S_{N}}1_{\mathrm{CB}}$ mechanism in the case of $\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$, only(D) $\mathrm{S_{N}}1_{\mathrm{CB}}$ mechanism in both the complexesCorrect explanation(s) is/are