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.
\[\begin{array}{cc}
\ce{CH3 - CH - CH2Cl + NaI ->[Acetone]}\\
|\phantom{..................}\\
\ce{CH3\phantom{...............}}
\end{array}\]
Write the structure and IUPAC name of the major product in the following reaction.
\[\ce{CH3 - CH2Br + SbF3 ->}\]
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
Aromatic electrophilic substitution with iodine can be carried out using _____________
Give reason. Though alkyl halides are moderately polar, they are insoluble in water.
Which of the following reaction proves the chlorinating property of phosphorus pentachloride?
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?
Alkyl halides can be hydrolysed to alcohols by reacting with ____________.
Amongst the following, HBr reacts fastest with
Identify the INCORRECT statement.
The following reaction is known as:
\[\ce{R - Cl + NaI ->[acetone] R - I + NaCl ↓}\]
The reaction \[\ce{2R - Cl + COF2 -> 2R - F + COCl2}\] is an example of ______.
An alkyl iodide on refluxing with aqueous KOH solution gave isopropyl alcohol. The structure of alkyl iodide could be:
Identify the name of reaction in which alkyl fluorides are prepared by heating alkyl bromide with metallic fluorides.
Alkyl chloride when treated with sodium iodide in presence of dry acetone forms alkyl iodide. What is the name of this reaction?
Explain Swartz reaction.
How is alkyl halide converted into alcohol by using?
Aqueous NaOH (or KOH)
How is alkyl halide converted into alcohol by using Moist silver oxide?
Complete the following reaction giving major product.
\[\begin{array}{cc}
\ce{CH3}\phantom{.................}\\
|\phantom{...................}\\
\ce{CH3 - C - CH2 - Cl ->[Na/dry ether] A}\\
|\phantom{...................}\\
\ce{CH3}\phantom{................}
\end{array}\]
The given compound
is an example of ______.
Which of the following acid strengths is used to get a good yield of alkyl iodide from alcohol and sodium iodide in phosphoric acid?
