Question
What is meant by hydroboration-oxidati on reaction? Illustrate it with an example.
✓
Answer
Hydroboration-Oxidation : The addition of borane followed by oxidation is known as the hydroboration0oxidation reaction. For example, propan-1-ol is produced by the hydroboration-oxidation reaction of propene. In this reaction, propene reacts with diborane $\left( B _2 H _6\right)$ to form tri alkyl borane as an addition product. This addition product is oxidised to alcohol by hydrogen peroxide in the presence of aqueous NaOH .
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Describe the oxidising action of potassium dichromate and write the ionic equation for its reaction with :
(i) Iodide, (ii) Iron, (II) solution and (iii) H2S
(i) Iodide, (ii) Iron, (II) solution and (iii) H2S
What are enantiomers? Draw the structures of the possible enantiomers of 3-methylpent-1-ene.
Consider the decomposition of hydrogen peroxide in alkaline medium which is catalysed by iodide ions.
$\text{2H}_2\text{O}_2\xrightarrow{\text{OH}^-}2\text{H}_2\text{O}+\text{O}_2$
This reaction takes place in two step as given below:
Step-I $\text{H}_2\text{O}_2+\text{I}^-\rightarrow\text{H}_2\text{O}_2+\text{IO}^-\text{ (slow)}$
Step-II $\text{H}_2\text{O}_2+\text{IO}^-\rightarrow\text{H}_2\text{O}_2+\text{I}+\text{O}_2\text{ (fast})$
→$\text{2H}_2\text{O}_2\xrightarrow{\text{OH}^-}2\text{H}_2\text{O}+\text{O}_2$
This reaction takes place in two step as given below:
Step-I $\text{H}_2\text{O}_2+\text{I}^-\rightarrow\text{H}_2\text{O}_2+\text{IO}^-\text{ (slow)}$
Step-II $\text{H}_2\text{O}_2+\text{IO}^-\rightarrow\text{H}_2\text{O}_2+\text{I}+\text{O}_2\text{ (fast})$
- Write the rate law expression and determine the order of reaction w.r.t. H2O2.
- What is the molecularity of each individual step?
What is stereochemistry ? Explain plane polarised light, optical activity and optical isomers.
A solution of H2O2 when titrated against KMnO4 solution at different intervals of time gave the following results:
| Time (minutes) | 0 | 10 | 20 |
| Volume of KMnO4 (mL) | 23.8 | 14.7 | 9.1 |
Show that decomposition of H2O2 is first order reaction.
Write the Nernst equation and emf of the following cells at 298 K:
Fe(s) | Fe2+(0.001M) || H+ (1M) | H2(g)(1bar) | Pt(s)
Fe(s) | Fe2+(0.001M) || H+ (1M) | H2(g)(1bar) | Pt(s)
Explain Van't Hoff factor.
Match the items of column I with items of column II.
| Column I | | Column II | |
| (i) | Antifreeze used in car engine | (a) | Neutral ferric chloride |
| (ii) | Solvent used in perfumes | (b) | Glycerol |
| (iii) | Starting material for picric acid | (c) | Methanol |
| (iv) | Wood spirit | (d) | Phenol |
| (v) | Reagent used for detection of phenolic group | (e) | Ethleneglycol |
| (vi) | By product of soap industry used in cosmetics | (f) | Ethanol. |
Calculate the charge of one mole of electrons.