Identifying unknown substances

A friend of yours who is a graduate student attempting to establish the structure of a chemical species from field clover, isolated an alcohol that was found to have an optical rotation of +49.5 degrees. Chemical analysis gave a molecular formula of C5H10O. It was also observed that this alcohol readily decolorized Br2-CH2Cl2 so ...continues

An Organic compound

An Organic compound (C9H10O) showed strong absorption in the IR spectrum at 1735/cm-1 and gave a semicarbazone having a melting point of 198 degrees C. It burned with a yellow, sooty flame and also gave a positive iodoform test. The 1H NMR spectrum of the compound provided the following information: 2.11 ppm 3H(singlet) 3. ...continues

Identifying unknown liquid

A colorless liquid, bp = 199 - 201 degrees C, burns with a yellow, sooty flame. The sodium fusion test proved negative for the presence of halogens, nitrogen, and sulfur. It was not soluble in water, 5% aqueous sodium hydroxide, or 5% hydrochloric acid. However, it dissolved in sulfuric acid with evolution of heat. It did not g ...continues

Indentify unknown organic liquids

An unknown organic liquid A, was found to burn with a yellow, sooty flame and give positive Lucas test (about 5 minutes). Upon treatment with sodium dichromate-sulfuric solution it produced compound B which also burned with a yellow sooty flame. Compound B gave a positive 2,4-dinitrophenylhydrazine test, but a negative result wh ...continues

Identifying unknown compounds

A hydrocarbon A (C6H10) burned a yellow, almost non-smokey flame. On catalytic hydrogenation over platinum catalyst it absorbed 1 mol of hydrogen to form compound B it also decolorized a Br2-CH2CL2 solution to yield a dibromo derivative C. Ozonolysis of the hydrocarbon gave only one compound D. Compound D gave a positive iodofor ...continues

Identifying unknown liquid and precipitate

A high-boiling bp = 202 - 204 degrees C, burns with a yellow, sooty flame. Sodium fusion indicates that halogens, nitrogen and sulfur are not present. It is not soluble in water, dilute sodium bicarbonate solution, or dilute hydrochloric acid. However, it proved to be soluble in 5% aqueous sodium hydroxide solution. The compound ...continues

Identifying 3 unknown compounds

A low-melting solid (compound A) was isolated, and combustion analysis showed it had compisition C9H10O. The substance gave a precipitate when treated with 2,4-dinitrophenylhydrazine solution. Furthermore, when reacted with iodoform reagent, a yellow precipitate of CHI3 was observed. Acidification of the alkaline solution from t ...continues

Identifying another 3 unknown compounds

An unknown compound (A) was soluble in ether but only slightly soluble in water. It burned with a clear blue flame and combustion analysis showed it to have a molecular formula of C5H10O. It gave a positive test with the jones reagent producing a new compound (B) with a formula C5H10O. Compound B gave a positive iodoform test an ...continues

Identifying 4 unknown compounds

Compound A (C7H14) decolorized a Br2-CH2Cl2 solution. It reacted with BH3*THF reagent, followed by alkaline peoxide solution, to produce Compound B. Compound B on treatment with chromic-acid sulfuric acid solution, gave carboxylic acid C, which could be seperated into two enantiomers. Compound A, on treatment with ozone, followe ...continues

Identifying 3 unknown compounds

Compound A (C8H16) decolorized a bromine-methylene chloride solution. Ozonolysis produced two compounds, B and C, which could be separated easily by GC. Both B and C gave a positive 2,4-dinitophenylhydrazine test. Carbon-hydrogen analysis and molecular weight determination of B gave a molecular formula of C5H10O. The 1H NMR spec ...continues