1》In the reaction, RMgBr HC(OET)3 in presence of ether what is the product A and A reacts in presence of H3O .what will be product B.,?? (PLEASE SOLVE IT)》》》2》The major products obtained during ozonolysis of 2,3-dimethyl-1-butene and subsequent reductions with Zn and H2O are=》》》》》 A.methanoic acid and 2-methyl-2-butanone》》》 B.methanal and 3-methyl-2-butanone 》》》C.methanol and 2,2-dimethyl-3-butanone 》》》D.methanoic acid and 2-methyl-3-butanone
(I can't understand please explain these above questions).?

Question

Answer

Answer

1. Reactions of RMgBr with HC(OET)3 in the presence of ether:
- The reaction between RMgBr (a Grignard reagent) and HC(OET)3 (acetylacetone) in the presence of ether typically results in the formation of a ketone.
- The product A in this reaction would be a ketone, specifically the addition of the acetylacetone group to the RMgBr compound.

2. Reaction of A with H3O+:
- The product A, which is a ketone, can react with H3O+ (water in acidic conditions) through a nucleophilic addition reaction.
- The nucleophile, H3O+, attacks the electrophilic carbonyl carbon of the ketone, leading to the formation of a hemiketal intermediate.
- This intermediate further reacts with water molecules, resulting in the formation of a ketal.

- The product B in this reaction would be a ketal, which is a compound containing two ether groups attached to a carbon atom.

2,3-dimethyl-1-butene ozonolysis and subsequent reductions:
- Ozonolysis is a reaction that involves the cleavage of carbon-carbon double bonds by ozone (O3).
- In the ozonolysis of 2,3-dimethyl-1-butene, the double bond between carbons 2 and 3 is broken, resulting in the formation of two carbonyl compounds.
- The major products obtained from the ozonolysis reaction would be two carbonyl compounds, one containing a terminal aldehyde group and the other containing a ketone group.

- Subsequent reductions with Zn and H2O convert the carbonyl compounds into their respective alcohols.
- The aldehyde group is reduced to a primary alcohol, while the ketone group is reduced to a secondary alcohol.

- The major products obtained from the ozonolysis and subsequent reductions of 2,3-dimethyl-1-butene would be methanal (formaldehyde) and 3-methyl-2-butanone (also known as methyl isobutyl ketone).

Therefore, the correct answer would be B. Methanal and 3-methyl-2-butanone are the major products obtained during the ozonolysis of 2,3-dimethyl-1-butene and subsequent reductions with Zn and H2O.

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