Single Choice

The best yield of given product can be obtained by using which set of reactants $$X$$ and $$Y$$?

A$$PhLi$$ + Neopentyl chloride
B$$PhMgBr$$ + Neopentyl bromide
C$$t- Bu - MgBr$$ + Benzyl bromide
Correct Answer
DBenzylchloride + t - Butyl chloride $$\xrightarrow{Na}$$

Solution

$$t-butyl MgBr$$ gives butane as the major product and tertiary Grignard reagent is preferred. The product formed is butane. When Grignard reagent like alkyl$$MgBr$$ reacts with alkene we get alkane corresponding to the alkyl part of Grignard reagent. In this reagent, the $$C$$ atom is more electronegative than $$Mg$$ hence the alkyl part acts as a nucleophile and takes an active $$H$$ to form the corresponding alkane and here butane.

SIMILAR QUESTIONS

Haloalkanes and Haloarenes

Which of the following can give a Grignard reagent when reacted with magnesium in dry ether ?

Haloalkanes and Haloarenes

Provide the structure of compound $$A$$ in the following reaction.

Haloalkanes and Haloarenes

Which of the following does not form Grignard reagent on reaction with $$Mg$$ in the presence of ether?

Haloalkanes and Haloarenes

An example of a sigma bonded organometallic compound is:

Haloalkanes and Haloarenes

An allylide on hydrolysis gives allylene. The alkaline earth metal cation of allylide dissolves in dry ether in the presence of alkyl halide to form Grignard reagent. The allylide is :

Haloalkanes and Haloarenes

In the following reaction, $$C_{6}H_{5}CH_{2}Br \underset {(ii)H_{3}O^{+}}{\xrightarrow {(i) Mg, Ether}} X$$, the product $$'X'$$ is:

Haloalkanes and Haloarenes

The final product obtained in the reaction is:

Haloalkanes and Haloarenes

Grignard reagent is prepared by the reaction between:

Haloalkanes and Haloarenes

The best yield of given product can be obtained by using which set of reactants $$X$$ and $$Y$$?

Haloalkanes and Haloarenes

$$RX\, +\, Mg\, \xrightarrow{Ether}\, RMgX\, \xrightarrow{CH_3OH}\, n- Butane$$ What can be $$R$$ in the above reaction sequence?

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