Formaldehyde give and addition product with methyl magnesium iodide. Which one aqueous hydrolysis gives:
Correct answer: B. C2H5OH
- A. CH3OH
- B. C2H5OH
- C. (CH3)2CHOH
- D. ....
Explanation
When a Grignard reagent reacts with aldehydes and ketones, it results in production of addition products which on hydrolysis gives primary, secondary and tertiary alcohol. The reaction is carried in presence of ether followed by H3O+. 1. When Grignard reagent reacts with methanal, it results in production of primary alcohol. 2. When Grignard reagent reacts with ethanal, it results in production of secondary alcohol. 3. When Grignard reagent reacts with ketone, it results in production of tertiary alcohol.
This question appeared on the ETEA MDCAT 2008 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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.
Practise Aldehydes and Ketones
679 free Aldehydes and Ketones MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Nucleophilic Addition Reactions questions
The reactions of aldehydes and ketones with ammonia derivative G-NH3 to form compounds containing >C=N-C and water is known as _ reaction.
Ethanal reacts with HCN to form cyanohydrin. This is an example of:
CH3―CH2―MgBr + H2O -> Br-Mg-OH + X , Where 'X' is:
Hemiacetal containing both
Ethanal reacts with CH3CH2Mg Br the product formed is:
The compound Aldehyde hydrazone is: