32. Which of the following is not a suitable so Which is the best method to acco

Question

32. Which of the following is not a suitable so Which is the best method to accomplish this transformation? 27. (A) acetone (B) tetrahydrofuran (C) diethyl ether (D) 12-dimethoxyethane (DME Which is the major product in this (A)1.CH,MgBr; 2. H,O (.LDA: 2. CH, (C) I.(CH)Cul:2. H,0 (D) 1. HBr: 2. CH,L 33. NHOH What is the product of this reaction? 28. reaction? 2. CHal cat. H OCHs (D)CH OH HN 34. Which is the product of this reaction? NaOH Which is the IUPAC name of the reactant used in this reaction? 29. (A) 3-hexanone (C) 2-pentanone CB) 3 pentanone (D) 2-butanone (1B) OH 30. Which reaction is essentially irreversible (K> 10%? cat. HO OH O + KCN 35. What is the product of this reaction? 1. NaOCH3 31. Which structure is not an intermediate in the acid- catalyzed acetal formation reaction? , (A) (B)o HO (B) (C) O HO

Explanation / Answer

27) option C is the best method.

Explanation: Reaction of organocopper reagent with alpha, beta-unsaturated carbonyl compound produces 1,4-addition product.

28) option D is the product.

Explanation: Reaction of ketone with NH2OH produces oxime as product.

29) option C is correct

Explanation: Reaction of grignard reagent with ketone produces tertiary alcohol as product.

30) option D is irreversible.

Explanation: Grignard reactions are irreversible.

31) option C is not an intermediate in acetal formation.

Explanation: protonation of ketone followed by attacks of 1,2-diol produces a hemiacetal as intermediate. which on further reaction with another -OH group produces acetal as product.

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