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Test: Grignard Reagent - Chemistry MCQ


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10 Questions MCQ Test - Test: Grignard Reagent

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Test: Grignard Reagent - Question 1

Which of the following reaction sequence that will best carry out the following preparation?

Detailed Solution for Test: Grignard Reagent - Question 1

In the first step, the Grignard forms the carbon-carbon bond. This results in an alkoxide (the conjugate base of an alcohol). To form the alcohol, it’s necessary to add acid at the end of the reaction and this reaction usually occurs in Et2O or THF followed by H3O+ work-ups.

Test: Grignard Reagent - Question 2

Which of the following reagents, when treated with phenylmagnesiuim bromide followed by acid workup, will yield 2-phenylethanol?

Detailed Solution for Test: Grignard Reagent - Question 2

Oxirane (ethylene oxide or epoxide) when treated with phenylmagnesiuim bromide (C6​H5​−Mg−Br) followed by acid workup, will yield 2-phenylethanol.

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Test: Grignard Reagent - Question 3

A Grignard’s reagent may be made by reacting magnesium with which of the following compound?

Detailed Solution for Test: Grignard Reagent - Question 3

A Grignard’s reagent can be formed by reacting magnesium with Ethyl iodide, as shown below;
C2H5I + Mg + Dryether → C2H5 − Mg − I (Ethylmagnesium iodide)

Test: Grignard Reagent - Question 4

Which of the following statements about Grignard reagent is false?

Detailed Solution for Test: Grignard Reagent - Question 4

It is supposed that the Mg-C bond is strongly polar covalent, not ionic. Grignard’s reagents are less reactive than organosodium, -potassium and -lithium compounds, that is the reason why it is more convenient to work with them.

Test: Grignard Reagent - Question 5

Which is not present in Grignard reagent?

Detailed Solution for Test: Grignard Reagent - Question 5

Grignard reagents are made from halogenoalkanes (haloalkanes or alkyl halides) and introduces some of their reactions. A Grignard reagent has a formula RMgX where X is a halogen, and R is an alkyl or aryl (based on a benzene ring) group.

Test: Grignard Reagent - Question 6

Which of the following compounds would not give tert-butyl alcohol when treated with excess methylmagnesium bromide?

Detailed Solution for Test: Grignard Reagent - Question 6

Acetaldehyde would not give tert-butyl alcohol when treated with excess methylmagnesium bromide, as the Grignard Reaction is the addition of an organomagnesium halide (Grignard reagent) to a ketone or aldehyde, to form a tertiary or secondary alcohol, respectively.

Test: Grignard Reagent - Question 7

Which of the following compounds gives a primary alcohol upon reaction with phenylmagnesium bromide?

Detailed Solution for Test: Grignard Reagent - Question 7

Ethylene oxide reacts with Grignard reagents to give, after protonation, primary alcohols with two additional carbon atoms.

Test: Grignard Reagent - Question 8

Which of the following compounds gives a secondary alcohol upon reaction with methylmagnesium bromide?

Detailed Solution for Test: Grignard Reagent - Question 8

Pentanal gives a secondary alcohol upon reaction with methylmagnesium bromide, as the Grignard Reaction is the addition of an organomagnesium halide (Grignard reagent) to a ketone or aldehyde, to form a tertiary or secondary alcohol, respectively.

Test: Grignard Reagent - Question 9

Which of the following compounds does not give a tertiary alcohol upon reaction with methylmagnesium bromide/?

Detailed Solution for Test: Grignard Reagent - Question 9

3-Methylpentanal does not give a tertiary alcohol upon reaction with methylmagnesium bromide (a Grignard reagent).


  • Grignard reagents react with carbonyl compounds to form alcohols.
  • Aldehydes (like 3-methylpentanal) react with Grignard reagents to form secondary alcohols.
  • Ketones react to form tertiary alcohols.
  • Esters react to form tertiary alcohols after two equivalents of Grignard reagent.

Since 3-methylpentanal is an aldehyde, it forms a secondary alcohol, not a tertiary one.

Test: Grignard Reagent - Question 10

Alkyl halides can be converted into Grignard reagents by _______________

Detailed Solution for Test: Grignard Reagent - Question 10

Alkyl halides can be converted into Grignard reagents by warming them with magnesium powder in dry ether.
RX + Mg + Dry ether → R−Mg−X

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