Objective Questions

Questions (1999)

#	Question	Topic	Actions
501	Steam distillation is particularly useful for isolating which type of compounds…	Isolation and Purification of Organic Compounds	View
502	Which separation technique is based on the differential solubility of compounds…	Isolation and Purification of Organic Compounds	View
503	Which of the following is NOT a common solvent used in liquid-liquid extraction?	Isolation and Purification of Organic Compounds	View
504	In column chromatography, the stationary phase is typically which of the follow…	Isolation and Purification of Organic Compounds	View
505	In thin layer chromatography (TLC), what phenomenon causes the solvent to move …	Isolation and Purification of Organic Compounds	View
506	What does Rf stand for in chromatography?	Isolation and Purification of Organic Compounds	View
507	What is the formula for calculating Rf value in chromatography?	Isolation and Purification of Organic Compounds	View
508	In recrystallization, a suitable solvent should have which property?	Isolation and Purification of Organic Compounds	View
509	What is the purpose of recrystallization?	Isolation and Purification of Organic Compounds	View
510	A mixture of chloroform (bp 60°C) and aniline (bp 189°C) can be separated by wh…	Isolation and Purification of Organic Compounds	View
511	Which technique would be most appropriate for separating a mixture of methanol …	Isolation and Purification of Organic Compounds	View
512	The separation of petroleum into gasoline, kerosene, and diesel is achieved by …	Isolation and Purification of Organic Compounds	View
513	In column chromatography, the process of washing the adsorbed compounds off the…	Isolation and Purification of Organic Compounds	View
514	When a mixture is spotted on a TLC plate and developed, the solvent front trave…	Isolation and Purification of Organic Compounds	View
515	Which of the following statements about recrystallization is FALSE?	Isolation and Purification of Organic Compounds	View
516	In liquid-liquid extraction, the separatory funnel allows separation of two lay…	Isolation and Purification of Organic Compounds	View
517	Which technique would be best for isolating a heat-sensitive natural product fr…	Isolation and Purification of Organic Compounds	View
518	What is the stationary phase in thin layer chromatography (TLC) typically coate…	Isolation and Purification of Organic Compounds	View
519	Which of the following is a common application of extraction in organic chemist…	Isolation and Purification of Organic Compounds	View
520	In a TLC experiment, if the solvent front travels 8 cm and a compound travels 2…	Isolation and Purification of Organic Compounds	View
521	What does a low Rf value indicate in TLC?	Isolation and Purification of Organic Compounds	View
522	What does a high Rf value indicate in TLC?	Isolation and Purification of Organic Compounds	View
523	Which of the following is NOT a method of purification or separation?	Isolation and Purification of Organic Compounds	View
524	In column chromatography, which type of compound elutes first when using a nonp…	Isolation and Purification of Organic Compounds	View
525	The principle of crystallization relies on the fact that:	Isolation and Purification of Organic Compounds	View
526	Which chromatographic technique is most useful for quickly checking the purity …	Isolation and Purification of Organic Compounds	View
527	When performing a recrystallization, if crystals do not form upon cooling, what…	Isolation and Purification of Organic Compounds	View
528	In steam distillation, the total vapor pressure equals:	Isolation and Purification of Organic Compounds	View
529	Which of the following is an advantage of steam distillation over simple distil…	Isolation and Purification of Organic Compounds	View
530	In liquid-liquid extraction, if a compound is more soluble in the organic layer…	Isolation and Purification of Organic Compounds	View
531	What is the name of the glassware used for liquid-liquid extraction?	Isolation and Purification of Organic Compounds	View
532	Which of the following pairs are commonly separated by simple distillation?	Isolation and Purification of Organic Compounds	View
533	In chromatography, the mobile phase is:	Isolation and Purification of Organic Compounds	View
534	In recrystallization, if too much solvent is used, what will happen?	Isolation and Purification of Organic Compounds	View
535	Filtration is often used in conjunction with which other purification technique?	Isolation and Purification of Organic Compounds	View
536	Which of the following statements about Rf values is TRUE?	Isolation and Purification of Organic Compounds	View
537	In distillation, what is the purpose of the condenser?	Isolation and Purification of Organic Compounds	View
538	What is the purpose of adding boiling chips or stones to a distillation flask?	Isolation and Purification of Organic Compounds	View
539	Which technique would be best for separating a mixture of a solid that sublimes…	Isolation and Purification of Organic Compounds	View
540	In vacuum distillation, the pressure is reduced to:	Isolation and Purification of Organic Compounds	View
541	Which of the following is an example of a stationary phase in gas chromatograph…	Isolation and Purification of Organic Compounds	View
542	The separation of a mixture of two immiscible liquids can also be achieved by s…	Isolation and Purification of Organic Compounds	View
543	Which of the following is NOT a typical use of separation techniques in organic…	Isolation and Purification of Organic Compounds	View
544	During recrystallization, if colored impurities are present, what can be added …	Isolation and Purification of Organic Compounds	View
545	Which type of chromatography separates based on molecular size (sieving effect)?	Isolation and Purification of Organic Compounds	View
546	What is the mobile phase in column chromatography?	Isolation and Purification of Organic Compounds	View
547	Which of the following is a common drying agent used to remove traces of water …	Isolation and Purification of Organic Compounds	View
548	The process of converting a solid directly to a gas without passing through the…	Isolation and Purification of Organic Compounds	View
549	How many π bonds are present in a carbon‑carbon triple bond?	Alkynes: Structure, Bonding, and Nomenclature	View
550	What is the IUPAC name for CH₃CH₂C≡CH?	Alkynes: Structure, Bonding, and Nomenclature	View
551	Why is the C–H bond of a terminal alkyne more acidic than the C–H bonds of alka…	Alkynes: Structure, Bonding, and Nomenclature	View
552	Which reagent is used to test for terminal alkynes by forming a white precipita…	Alkynes: Structure, Bonding, and Nomenclature	View
553	What product is obtained from the reaction of calcium carbide (CaC₂) with water?	Alkynes: Structure, Bonding, and Nomenclature	View
554	What type of isomerism exists between 1‑butyne and 2‑butyne?	Alkynes: Structure, Bonding, and Nomenclature	View
555	What is the approximate pKa of a terminal alkyne (e.g., ethyne)?	Alkynes: Structure, Bonding, and Nomenclature	View
556	What is the product when 1‑butyne is treated with NaNH₂ in liquid NH₃?	Alkynes: Structure, Bonding, and Nomenclature	View
557	Which reaction allows an internal alkyne to be prepared from a terminal alkyne?	Alkynes: Structure, Bonding, and Nomenclature	View
558	What is the major product of the hydration of 1‑butyne (CH₃CH₂C≡CH) with HgSO₄/…	Alkynes: Structure, Bonding, and Nomenclature	View
559	Which catalyst is used for the partial hydrogenation of an alkyne to a cis‑alke…	Alkynes: Structure, Bonding, and Nomenclature	View
560	What is the product when an internal alkyne is reduced with sodium in liquid am…	Alkynes: Structure, Bonding, and Nomenclature	View
561	How many equivalents of H₂ are required to fully hydrogenate an alkyne to an al…	Alkynes: Structure, Bonding, and Nomenclature	View
562	What is the product of ozonolysis (O₃ followed by H₂O) of 2‑butyne (CH₃C≡CCH₃)?	Alkynes: Structure, Bonding, and Nomenclature	View
563	Why do alkynes react with Br₂ but alkanes do not under normal conditions?	Alkynes: Structure, Bonding, and Nomenclature	View
564	What is the major product when propyne (CH₃C≡CH) reacts with one equivalent of …	Alkynes: Structure, Bonding, and Nomenclature	View
565	Which base is strong enough to deprotonate a terminal alkyne (pKa ≈ 25)?	Alkynes: Structure, Bonding, and Nomenclature	View
566	What hybridization change occurs when an alkyne is partially hydrogenated to an…	Alkynes: Structure, Bonding, and Nomenclature	View
567	What is the product of the reaction of sodium acetylide (HC≡CNa) with 1‑bromopr…	Alkynes: Structure, Bonding, and Nomenclature	View
568	Which alkyne is also known as dimethylacetylene?	Alkynes: Structure, Bonding, and Nomenclature	View
569	What is the product when 2‑butyne is treated with excess Br₂?	Alkynes: Structure, Bonding, and Nomenclature	View
570	Which method is used to prepare an alkyne from a vicinal dihalide?	Alkynes: Structure, Bonding, and Nomenclature	View
571	What product is formed when ethylmagnesium bromide (CH₃CH₂MgBr) reacts with pro…	Alkynes: Structure, Bonding, and Nomenclature	View
572	What type of precipitate is formed when a terminal alkyne reacts with Cu₂Cl₂ in…	Alkynes: Structure, Bonding, and Nomenclature	View
573	What is the molecular formula of a cyclic alkyne with 5 carbons (e.g., cyclopen…	Alkynes: Structure, Bonding, and Nomenclature	View
574	Which reaction is used to synthesize higher alkynes from lower alkynes?	Alkynes: Structure, Bonding, and Nomenclature	View
575	What is the common name for HC≡C–CH₂–CH₂–CH₃?	Alkynes: Structure, Bonding, and Nomenclature	View
576	What is the product when 2‑butyne is hydrogenated with H₂ / Lindlar’s catalyst?	Alkynes: Structure, Bonding, and Nomenclature	View
577	What is the product when 2‑butyne is reduced with Na/NH₃ (liquid)?	Alkynes: Structure, Bonding, and Nomenclature	View
578	What type of products are obtained from the reductive ozonolysis of an alkyne?	Alkynes: Structure, Bonding, and Nomenclature	View
579	Why do only terminal alkynes react with AgNO₃/NH₃?	Alkynes: Structure, Bonding, and Nomenclature	View
580	What is the product when acetylene reacts with two equivalents of HBr?	Alkynes: Structure, Bonding, and Nomenclature	View
581	Which statement about the carbon–carbon triple bond is FALSE?	Alkynes: Structure, Bonding, and Nomenclature	View
582	What is the major product when ethylamine is treated with excess CH₃I?	Alkynes: Structure, Bonding, and Nomenclature	View
583	What is the name of the rule that predicts the major product in elimination rea…	Alkynes: Structure, Bonding, and Nomenclature	View
584	Which reagent converts an alkene to an aldehyde with one fewer carbon (oxidativ…	Alkynes: Structure, Bonding, and Nomenclature	View
585	What stereochemistry results from syn hydroxylation of an alkene with OsO₄?	Alkynes: Structure, Bonding, and Nomenclature	View
586	What is the major product from the reaction of 2‑methylpropene with H₂O in the …	Alkynes: Structure, Bonding, and Nomenclature	View
587	What is the common name for (CH₃)₂C=CH₂?	Alkynes: Structure, Bonding, and Nomenclature	View
588	What is the name of the rule that predicts the major product of elimination as …	Alkynes: Structure, Bonding, and Nomenclature	View
589	What is the product when an unsymmetrical alkene undergoes anti‑Markovnikov add…	Alkynes: Structure, Bonding, and Nomenclature	View
590	What is the product of catalytic hydrogenation of 2‑butene?	Alkynes: Structure, Bonding, and Nomenclature	View
591	What is the test for unsaturation that involves decolorization of brown bromine…	Alkynes: Structure, Bonding, and Nomenclature	View
592	What is the 3D shape around the carbon atoms in an alkyne?	Alkynes: Structure, Bonding, and Nomenclature	View
593	What is the correct IUPAC name for the compound CH₃CH₂C≡CCH₃?	Alkynes: Structure, Bonding, and Nomenclature	View
594	What is the functional group present in amines?	Fundamentals of Amines: Nomenclature, Isomerism, and Synthesis	View
595	What is the IUPAC name for CH₃CH₂CH₂NH₂?	Fundamentals of Amines: Nomenclature, Isomerism, and Synthesis	View
596	What is the common name for (CH₃)₃N?	Fundamentals of Amines: Nomenclature, Isomerism, and Synthesis	View
597	What type of amine is aniline (C₆H₅NH₂)?	Fundamentals of Amines: Nomenclature, Isomerism, and Synthesis	View
598	For the ammonolysis of alkyl halides to proceed efficiently via SN₂, the alkyl …	Fundamentals of Amines: Nomenclature, Isomerism, and Synthesis	View
599	What is the product of the reduction of a nitrile (R-C≡N) with LiAlH₄?	Fundamentals of Amines: Nomenclature, Isomerism, and Synthesis	View
600	Reduction of nitroalkanes (R-NO₂) with Sn/HCl produces:	Fundamentals of Amines: Nomenclature, Isomerism, and Synthesis	View

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Questions (1999)