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.
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.
Give reason. Though alkyl halides are moderately polar, they are insoluble in water.
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
Which of the following pairs of aryl halides cannot be prepared directly by electrophilic substitution?
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 ____________.
Alkyl fluorides are prepared by heating alkyl bromides or chlorides in the presence of metallic fluorides. The reaction is known as ____________ reaction.
Conversion of an alcohol into alkyl chloride by reacting with thionyl chloride is done in a medium of ____________.
Amongst the following, HBr reacts fastest with
Which reaction is useful in exchange of halogen in alkyl chloride by iodide?
Identify the INCORRECT statement.
The following reaction is known as:
\[\ce{R - Cl + NaI ->[acetone] R - I + NaCl ↓}\]
What is the relative rate of SN2 reaction for (CH3)3C - Br?
The reaction \[\ce{2R - Cl + COF2 -> 2R - F + COCl2}\] is an example of ______.
Which one of the following is Swartz reaction?
The conversion of ethyl bromide using sodium iodide and dry acetone, this reaction is know as ______.
Choose the false statement from the following.
Explain Swartz reaction.
Explain the preparation of alkyl halide using thionyl chloride (SOCl2).
What is the advantage of alkyl halide using the thionyl chloride (SOCl2 ) method?
