Advertisements
Advertisements
प्रश्न
What is Grignard reagent? How is it prepared? Why are they prepared under anhydrous condition?
Advertisements
उत्तर
- Grignard reagent: When alkyl halide is treated with magnesium in the dry ether as the solvent, it gives alkyl magnesium halide. This is known as the Grignard reagent.
- The Grignard reagent can be prepared as,
\[\ce{\underset{Alkyl halide}{R - X} + Mg ->[dry ether] \underset{\text{Alkyl magnesium halide (Grignard reagent)}}{R - Mg - X}}\] - Grignard reagents are highly reactive compounds.
- They react with water or compounds containing hydrogen attached to the electronegative element.
Hence, reactions involving Grignard reagent must be carried out under anhydrous condition.
APPEARS IN
संबंधित प्रश्न
Write the structure and IUPAC name of the major product in the following reaction.
Give reason:
Alkyl halides are generally not prepared by free radical halogenation of alkanes.
Convert the following:
But-1-ene to n-butyl iodide
Predict all the alkenes that would be formed by dehydrohalogenation of the following alkyl halide.
- 2-chloro-2-methylbutane
- 3-bromo-2,2,3-trimethylpentane
The compound formed when 3, 5-dinitrobenzoic acid reacts with thionyl chloride is ___________.
Which among the following methods is not suitable for the preparation of alkyl chlorides?
What is the name of reaction involving replacement of diazonium group by chloride using cuprous (I) salt?
Alkyl halides can be hydrolysed to alcohols by reacting with ____________.
Amongst the following, HBr reacts fastest with
Which reaction is useful in exchange of halogen in alkyl chloride by iodide?
The following reaction is known as:
\[\ce{R - Cl + NaI ->[acetone] R - I + NaCl ↓}\]
Identify 'A' in the following reaction: \[\ce{C2H5OH + HCl ->[A] C2H5Cl + H2O}\]
An alkyl iodide on refluxing with aqueous KOH solution gave isopropyl alcohol. The structure of alkyl iodide could be:
Alkyl chloride when treated with sodium iodide in presence of dry acetone forms alkyl iodide. What is the name of this reaction?
The conversion of ethyl bromide using sodium iodide and dry acetone, this reaction is know as ______.
How is alkyl halide converted into alcohol by using?
Aqueous NaOH (or KOH)
Explain the preparation of alkyl halide using thionyl chloride (SOCl2).
What is the advantage of alkyl halide using the thionyl chloride (SOCl2 ) method?
Complete the following reaction giving major product.
\[\begin{array}{cc}
\ce{CH3}\phantom{.................}\\
|\phantom{...................}\\
\ce{CH3 - C - CH2 - Cl ->[Na/dry ether] A}\\
|\phantom{...................}\\
\ce{CH3}\phantom{................}
\end{array}\]
