1. which of the following reactions involves the formation ofa methyl ester from

Question

1. which of the following reactions involves the formation ofa methyl ester from a carboxylic acid? a. cope elimination b. Hell-Volhard_Zelinsky reaction c. reaction with CH2N2 d. Hunsdiecker reaction e. hydroboration with diborane 2. the conversion of butanoic acid to 2 -pentanone is bestaccomplished with: a. 1. thionyl chloride; 2. methylmagnesium bromide b. methyllithium c. 1. methanol, sulfuric acid; 2. methyllithium d. 1. thionyl chloride; 2. methanol e. 1. sulfuric acid; 2. methanol 3. An acid which could NOT be prepared from an organic halideby carboxylation of the Grignard reagent is : a. benzoic acid b. 2,2- dimethylpropanoic acid c. propanoic acid d. 4-oxocyclohexanecarboxylic acid e. 2- methylbutanoic acid 4. An acid which could NOT be prepared by the reaction of anorganic halide with cyanide ion followed by acid hydrolysis of thenitrile is: a. propanoic acid b. phenylacetic acid c. acetic acid d. (CH3)3CCO2H e. CH3(CH2)14CO2H 5. How does the O-H stretch in the IR spectrum of a carboxylicacid differ from teh O-H stretch of an alcohol? a. the OH of a carboxylic acid absorbs at a much higherwavenumber; 4000 cm b. The OH of a carboxylic acid is much narrower c. the OH of a carboxylic acid appears below 3000 cm d. the O-H of a carboxylic acid is broader and shifted tolower wavenumbers e. None of the above 6. What alkyllithium would react with acetic acid to form 2 -butanone? a. methyllithium b. vinyllithium c. ethyllithium d. propyllithium e.phenyllithium 7. Lithium aluminum hydride reduces carboxylic acids toprimary alcohols via what intermediate? a. a ketone b. a methyl ester c. an aldehyde d. a secondary alcohol e. an acid chloride 8. the first mechanistic step in the direct reaction of anamine with a carboxylic acid to produce an amide is: a. an acid base reaction b. nucleophilic attack ont eh carbonyl carbon c. loss of H20 d. loss of CO2 e. loss of N2 9. Esters and amides are most easily made by nucelophilic acylsubstitution reactions on: a. alcohols b. acid anhydrides c. carboxylates d. carboxylic acids e. acid chlorides 10. The methyl ester of a carboxylic acid can be synthesizeddirectly using: a. SOCl2 b. PCl5 c. C2O2Cl2 d. CH2N2 e. CH3NH2 11. What are the products of teh raction of phenylacetic acidwith oxalyl chloride? a. phenylacetate, HCL (g), CO (g), and CO2 (g) b. phenylacetyl chloride, HCL, CO, and CO2 c. phenoyl chloride, SO2, and HCl d. chlorobenzene, HCl, CO, and CO2 e. m- chlorophenylacetic acid, HCl, CO, and CO2 1. which of the following reactions involves the formation ofa methyl ester from a carboxylic acid? a. cope elimination b. Hell-Volhard_Zelinsky reaction c. reaction with CH2N2 d. Hunsdiecker reaction e. hydroboration with diborane 2. the conversion of butanoic acid to 2 -pentanone is bestaccomplished with: a. 1. thionyl chloride; 2. methylmagnesium bromide b. methyllithium c. 1. methanol, sulfuric acid; 2. methyllithium d. 1. thionyl chloride; 2. methanol e. 1. sulfuric acid; 2. methanol 3. An acid which could NOT be prepared from an organic halideby carboxylation of the Grignard reagent is : a. benzoic acid b. 2,2- dimethylpropanoic acid c. propanoic acid d. 4-oxocyclohexanecarboxylic acid e. 2- methylbutanoic acid 4. An acid which could NOT be prepared by the reaction of anorganic halide with cyanide ion followed by acid hydrolysis of thenitrile is: a. propanoic acid b. phenylacetic acid c. acetic acid d. (CH3)3CCO2H e. CH3(CH2)14CO2H 5. How does the O-H stretch in the IR spectrum of a carboxylicacid differ from teh O-H stretch of an alcohol? a. the OH of a carboxylic acid absorbs at a much higherwavenumber; 4000 cm b. The OH of a carboxylic acid is much narrower c. the OH of a carboxylic acid appears below 3000 cm d. the O-H of a carboxylic acid is broader and shifted tolower wavenumbers e. None of the above 6. What alkyllithium would react with acetic acid to form 2 -butanone? a. methyllithium b. vinyllithium c. ethyllithium d. propyllithium e.phenyllithium 7. Lithium aluminum hydride reduces carboxylic acids toprimary alcohols via what intermediate? a. a ketone b. a methyl ester c. an aldehyde d. a secondary alcohol e. an acid chloride 8. the first mechanistic step in the direct reaction of anamine with a carboxylic acid to produce an amide is: a. an acid base reaction b. nucleophilic attack ont eh carbonyl carbon c. loss of H20 d. loss of CO2 e. loss of N2 9. Esters and amides are most easily made by nucelophilic acylsubstitution reactions on: a. alcohols b. acid anhydrides c. carboxylates d. carboxylic acids e. acid chlorides 10. The methyl ester of a carboxylic acid can be synthesizeddirectly using: a. SOCl2 b. PCl5 c. C2O2Cl2 d. CH2N2 e. CH3NH2 11. What are the products of teh raction of phenylacetic acidwith oxalyl chloride? a. phenylacetate, HCL (g), CO (g), and CO2 (g) b. phenylacetyl chloride, HCL, CO, and CO2 c. phenoyl chloride, SO2, and HCl d. chlorobenzene, HCl, CO, and CO2 e. m- chlorophenylacetic acid, HCl, CO, and CO2

Explanation / Answer

1. c. reaction with CH2N2 2.a. 1. thionyl chloride; 2. methylmagnesium bromide 5.d. the O-H of a carboxylic acid is broader and shifted tolower wavenumbers 6. c. ethyllithium. 7. c. an aldehyde. hope this helps

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