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The true statement about base hydrolysis of [Co(CN)5JsBr]3- is
- a)The rate is independent of the concentration of nucleophile
- b)The rate is dependent of the concentration of nucleophile
- c)The first order reaction is not possible
- d)The SN1CB mechanism is possible
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
The true statement about base hydrolysis of [Co(CN)5JsBr]3-isa)The rat...
The base hydrolysis of Co(lll) complexes with ligand without replaceable proton like [Co(CN)5Br]3- was found to be very low and independent of the concentration of nucleophile. Since the non-leaving ligand do not contain replaceable proton, the SN1CB mechanism is not possible.
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The true statement about base hydrolysis of [Co(CN)5JsBr]3-isa)The rat...
Base Hydrolysis of [Co(CN)5JsBr]3-
Statement: The rate is independent of the concentration of nucleophile
In base hydrolysis, a compound reacts with water in the presence of a base to form a hydroxide ion. The compound in question, [Co(CN)5JsBr]3-, contains a cobalt ion (Co3+) coordinated with five cyanide ions (CN-) and a bromide ion (Br-). The hydrolysis of this compound can be represented by the following equation:
[Co(CN)5JsBr]3- + OH- -> [Co(CN)5JsOH]2- + Br-
Rate of Reaction
The rate of a chemical reaction is determined by the rate-determining step, which is usually the slowest step in the reaction mechanism. In this case, the rate-determining step is likely the breaking of the Co-N bonds in the complex ion.
The hydrolysis reaction is an example of a nucleophilic substitution (SN) reaction, where the nucleophile (in this case, OH-) replaces a leaving group (in this case, Br-). The rate of an SN reaction is typically dependent on the concentration of the nucleophile.
Explanation
However, in this specific case, the rate of the base hydrolysis of [Co(CN)5JsBr]3- is independent of the concentration of the nucleophile (OH-). This can be attributed to the coordination environment of the cobalt ion.
The cobalt ion in [Co(CN)5JsBr]3- is highly polarized due to the presence of the highly electronegative cyanide ligands. This polarization results in a strong bonding between the cobalt ion and the cyanide ligands, making the Co-N bonds difficult to break. As a result, the rate-determining step of the reaction is the breaking of the Co-N bonds, rather than the attack of the nucleophile.
Since the rate of the reaction is determined by the rate-determining step, which is independent of the concentration of the nucleophile, the overall rate of the reaction is also independent of the concentration of the nucleophile (OH-). Therefore, the true statement about the base hydrolysis of [Co(CN)5JsBr]3- is that the rate is independent of the concentration of the nucleophile.
Statement: The rate is independent of the concentration of nucleophile
In base hydrolysis, a compound reacts with water in the presence of a base to form a hydroxide ion. The compound in question, [Co(CN)5JsBr]3-, contains a cobalt ion (Co3+) coordinated with five cyanide ions (CN-) and a bromide ion (Br-). The hydrolysis of this compound can be represented by the following equation:
[Co(CN)5JsBr]3- + OH- -> [Co(CN)5JsOH]2- + Br-
Rate of Reaction
The rate of a chemical reaction is determined by the rate-determining step, which is usually the slowest step in the reaction mechanism. In this case, the rate-determining step is likely the breaking of the Co-N bonds in the complex ion.
The hydrolysis reaction is an example of a nucleophilic substitution (SN) reaction, where the nucleophile (in this case, OH-) replaces a leaving group (in this case, Br-). The rate of an SN reaction is typically dependent on the concentration of the nucleophile.
Explanation
However, in this specific case, the rate of the base hydrolysis of [Co(CN)5JsBr]3- is independent of the concentration of the nucleophile (OH-). This can be attributed to the coordination environment of the cobalt ion.
The cobalt ion in [Co(CN)5JsBr]3- is highly polarized due to the presence of the highly electronegative cyanide ligands. This polarization results in a strong bonding between the cobalt ion and the cyanide ligands, making the Co-N bonds difficult to break. As a result, the rate-determining step of the reaction is the breaking of the Co-N bonds, rather than the attack of the nucleophile.
Since the rate of the reaction is determined by the rate-determining step, which is independent of the concentration of the nucleophile, the overall rate of the reaction is also independent of the concentration of the nucleophile (OH-). Therefore, the true statement about the base hydrolysis of [Co(CN)5JsBr]3- is that the rate is independent of the concentration of the nucleophile.
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The true statement about base hydrolysis of [Co(CN)5JsBr]3-isa)The rate is independent of the concentration of nucleophileb)The rate is dependent of the concentration of nucleophilec)The first order reaction is not possibled)The SN1CB mechanism is possibleCorrect answer is option 'A'. Can you explain this answer?
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