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प्रश्न
Write a short note on hydroboration.
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उत्तर
Diborane adds on to alkenes and alkynes in ether solvent at room temperature. This reaction is called hydroboration and is highly used in synthetic organic chemistry especially for anti-Markovnikov addition.
\[\ce{B2H6 + 6RCH = CHR -> 2(RCH2 - CHR3)B}\]
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संबंधित प्रश्न
An aqueous solution of borax is ____________.
Boric acid is an acid because its molecule ____________.
Which of the following metals has the largest abundance in the earth’s crust?
Match items in Column – I with the items of Column – II and assign the correct code.
| Column – I | Column – II |
| A. Borazole | 1. B(OH)3 |
| B. Boric acid | 2. B3N3H6 |
| C. Quartz | 3. Na2[B4O5(OH)4]8H2O |
| D. Borax | 4. SiO2 |
Give the uses of Borax.
Complete the following reaction.
\[\ce{Na2B4O7 + H2SO4 + H2O ->}\]
Complete the following reaction.
\[\ce{B2H6 + 2NaOH + 2H2O ->}\]
Complete the following reaction.
\[\ce{B2H6 +CH3OH ->}\]
Complete the following reaction.
\[\ce{B + NaOH ->}\]
A double salt which contains fourth-period alkali metal (A) on heating at 500 K gives (B). aqueous solution of (B) gives white precipitate with BaCl2 and gives a red colour compound with alizarin. Identify A and B.
