Indicate if the following statement is true (T) of false(F). Acetic acid is more
ID: 529920 • Letter: I
Question
Indicate if the following statement is true (T) of false(F). Acetic acid is more acidic than nitroacetic acid. Benzoic acid is more acidic than acetic acid. Boiling point of propapnoic acid is higher that water but lower than 2-butanol A typical IR absorption of ketones around 1720cm^-1 is due to c = O stretching. Both proton NMR of compound and B show absorption around -10, but A shows A near 2720- a broad absorption in the 3500-2500 cm and B shows two weak bands and B a 2820 cm Based on this data one can safely assume that A is an aldehyde carboxylic acid. The intramolecular esterification of hydroxy acids produce lactams. Both LiAIHe and NaBHe are efficient reducing agents which can be used to reduce carboxylic acids to alcohols Pyridinium dichromate (PDC or CrO_3 are milder oxidation agents than KMnO_4. and they can be used for oxidation of secondary or tertiary alcohols to ketones. A dangerous property of ethers is easily oxidized in air to form explosive peroxides. Macrocyclic polyethers are called crown ethers. They could trap a cation such as K in the molecule.Explanation / Answer
Ans IV
1. False
Nitro is a strong electron withdrawing group and increases the stability of acetate ion , hence increased acidity than acetic acid .
2. True
Benzoic acid is more acidic than acetic acid because the phenyl ring has negative inductive effect that pulls the electrons through resonance that creates a stable conjugate base .
3. False
Boiling point of propionic acid is more than water and 2 butanol both .
Boiling point of water and 2 butanol both is about 100o C whereas that of propionic acid is 141o C
4. True
The C=O group is most clearly observable peak on IR spectrum and the carbonyl stretching frequencies are more centered at 1720 cm-1