CH3―CH2―MgBr + H2O -> Br-Mg-OH + X , Where 'X' is:
Correct answer: D. Ethane
- A. Propane
- B. Butane
- C. Methane
- D. Ethane
Explanation
Explanation:The reaction is a typical Grignard reagent hydrolysis reaction where the Grignard reagent (CH3CH2MgBr) reacts with water to form an alcohol and a metal hydroxide salt. The balanced chemical equation is:CH3-CH2-MgBr + H2O → CH3-CH2-OH + Mg(OH)BrSo, the product X is Ethane, which is the alcohol formed in the reaction.
This question appeared on the UHS MDCAT 2009 paper, which you can sit online with every answer explained.
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About Nucleophilic Addition Reactions
Nucleophilic addition occurs at the polar carbonyl group of aldehydes and ketones, where a nucleophile attacks the electron-deficient carbon atom. Reactions with hydrogen cyanide, sodium bisulfite, alcohols and Grignard reagents are explained through tetrahedral intermediates, acid or base catalysis, and the different reactivity of aldehydes and ketones.
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