Quiz-ORGANIC CHEMISTRY

1. What is the IUPAC (and also common) name for cyclohex-1,3,5-triene?benzenephenolcyclohexanenaphtalene2. What catalyst is used during the hydrogenation of alkynes?FeCrNiCd3. Potassium permanganate is a stronger oxidizer than potassium dichromate.TrueFalse4. What is glycerin?an alcohol with three hydroxyl groupsa type of sugaran alcohol with two hydroxyl groupsall answers are incorrect5. What are polyunsaturated compounds?compounds with two or more double bondscompounds which lack hydrogencompounds with several missing oxygen atomscompounds with less carbon atoms than normal6. Which catalyst is used to oxidize naphthalene into phthalic acid?vanadium pentoxidepotassium permanganatephosphorus pentoxidepotassium dichromate7. What metal ion is the oxidizing agent in Tollens' reagent?Ag+Fe2+Cu+Fe3+8. What does the fact that alcohols react with highly reducing metals (such as sodium) prove?alcohols are basicalcohols are unsaturatedalcohols are saturatedalcohols are acidic solutions1. What is the IUPAC (and also common) name for cyclohex-1,3,5-triene? The correct answer was benzene Benzene, also known as benzol, is the most common aromatic hydrocarbon. It can be extracted from crude oil or synthesized from acetylene. It is the base ingredient for hundreds of drugs and synthetic materials.2. What catalyst is used during the hydrogenation of alkynes? The correct answer was Ni Without a metal catalyst, hydrogenation would require very high temperatures. The best catalysts for this type of reaction are platinum, palladium and rhodium but nickel is a much cheaper alternative (although less efficient).3. Potassium permanganate is a stronger oxidizer than potassium dichromate. The correct answer was t Potassium dichromate is used to oxidize alcohols into aldehydes (or carboxylic acids in certain conditions). Potassium permanganate is stronger, so its reactions will result only in carboxylic acids. Also, permanganate can break double bonds in alkyl groups, which dichromate can't.4. What is glycerin? The correct answer was an alcohol with three hydroxyl groups Glycerin, also known as glycerol (not to be confounded with glucose), has the official IUPAC name of propane-1,2,3-triol. It is widely used in the food industry as a humectant (because of its hygroscopic nature) to help preserve food by keeping it dry. Although not a sugar, it does taste sweet but it's also toxic in high quantities.5. What are polyunsaturated compounds? The correct answer was compounds with two or more double bonds Saturated compounds don't have any double or triple bonds between carbon atoms. Double bonds increase the compound's degree of unsaturation by 1, triple bonds by 2. A polyunsaturated compound has a degree of unsaturation of at least 2 (meaning it can addition at least 4 hydrogen atoms).6. Which catalyst is used to oxidize naphthalene into phthalic acid? The correct answer was vanadium pentoxide Vanadium pentoxide, when heated, will lose oxygen and help speed up the oxidizing process. Naphthalene is oxidized at around 350 degrees C, and results in carbon dioxide and water as byproducts.players have answered correctly.7. What metal ion is the oxidizing agent in Tollens' reagent? The correct answer was Ag+ Tollens' reagent is usually ammoniacal silver nitrate, but can also be other compounds, as long as there is an aqueous diamminesilver(I) complex. It was named after Bernhard Tollens.8. What does the fact that alcohols react with highly reducing metals (such as sodium) prove? The correct answer was alcohols are acidic Since the hydrogen in the alcohol's hydroxyl group is switched with a metal, the alcohol acts as a hydrogen ion donor, which is exactly how acids work. The result of the above mentioned process are alkoxides, conjugate bases of alcohols.Conjugate bases of weak acids are strong (and vice versa), so alcohols, being weak acids their alkoxides are strong bases.