Answer:
Central-metal oxidation state: +2
Coordination number: 6
Overall charge: -2
Explanation:
In the ion complex:
Na₂[Cr(NH₃)₂(NCS)₄]
The central-metal is Cr, the ligands are NH₃ and NCS.
The NH₃ is a neutral ligand, while NCS is an anionic ligand with -1 in charge.
The overall charge of the complex is:
2Na⁺ + [Cr(NH₃)₂(NCS)₄]⁻² → <em>-2</em>
As NCS gives -1 in charge and there are four NCS, The Cr must be in <em>+2</em> of oxidation state to give an overall charge of -2.
As Cr is bonded to 2 NH₃ and 4 NCS, the coordination number is 2+4 = <em>6</em>
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A) Moles
When converting the volume of a gas to the mass of a gas, the first step is to convert volume to moles.
The forecast for any particular day depends on where you are, within maybe 20 miles. You'll know whether it was accurate or not on the next day.
Answer:
Here's what I get
Explanation:
(a) There will be an equilibrium between propoxide and isopropyl alcohol.
CH₃CH₂CH₂O⁻ + (CH₃)₂CHO-H ⇌ CH₃CH₂CH₂OH + (CH₃)₂CHO⁻
The isopropoxide is the more basic ion, so it will be the better base and the better nucleophile.
(b) There is always a competition between substitution and elimination.
However, the temperature is moderate, so substitution will predominate.
(c) Attack on the substrate will occur at C-3, for two reasons:
- I is a better leaving group than Br.
- C-3 is 3°, while C-1 is 1°.
(d) The reaction will be an SN1 displacement reaction. The energy/reaction coordinate diagram is below.
(e) The rate-determining step is the first step — ionization of the alkyl iodide.
(f)The rate law is rate = k[R-I]
(g) The major product will be 1-bromo-3-methyl-3-(propan-2-yloxy)pentane.