Organic Chemistry 1 Lab Final
5. Retention factor is the ratio of ____________ A) Distance moved by substance from base line to distance moved by the solvent from base lineB) Distance moved by solvent from base line to distance moved by the substance from base lineC) Distance moved by substance from top line to distance moved by the solvent from top lineD) Distance moved by solvent from top line to distance moved by the substance from top line
A
5. The melting point of ice is ____________ a) 00Cb) 1000Cc) 40Cd) -40C
A
7. The reaction occurs in acidic solution. Whichstatement best describes the role of acid in thisreaction.A. The acid is acting in a catalytic fashionB. Acid is not involved in this reaction.C. The reaction uses one equivalent of acid.D. None of those
A
1. Which solvent you should choose for recrystallizing your organic compound ? If the compound is found to be: a) very soluble in solvent at room temperature b) soluble in hot solvent c) not soluble in solvent at any temperature. d) Any solvent will do the recrystallization
B
10. Suppose you are given two compounds: one is labeled, aspirin and the other one is unlabeled and you are told that it may or may not be aspirin. With your three lab class day lab background, how can you check they are the same aspirin? a) Take the boiling point for both the compounds b) Take the melting points of both the compounds c) Taste both the compounds d) Check the solubility
B
1] The basis of the technique of chromatography for separating components of a mixture is A) the absorption of infrared radiation by the components. B) the interaction of the components with both stationary and mobile phases. C) the differing movement of particles of different mass in an electric field. D) the deflection of charged particles in a magnetic field.
B
2. If you start with 5.0g of pinacol (Molar mass 118g) in your experiment to make pinacolone (Molar mass 100g), what will be the theoretical yield of pinacolone comared to pinacol mass (5.0g)? A) Higher B) Lower C) Same D) can't be predicted
B
2. When diluting an acid with water, always remember to: A) Pour water into acidB) Pour acid into waterC) Add both at the same time D) Do it whatever way you like
B
3. Can open-toed or open-heeled shoes be worn in the lab? A) YesB) NeverC) May be D) Always
B
3. If you are given a benzoic acid sample and you are asked to do (a) chemical tests, what you will do? A) add a reagent, 2,4-DNPH B) add baking soda solution C) add a reagent Ferric chloride D) add a reagent Tollens-s reagent
B
3. Predict whether the following pair of liquids would be miscible or immiscible? n- octanol and acetic acid A) Miscible B) Immiscible
B
4. Predict the solubility of anti-inflammatory medicine, Ibuprofen in acid or base. A) Soluble in hydrochloric acid B) Soluble in sodium hydroxide
B
4. The relative adsorption of each component of the mixture is expressed in terms of its ____________ A) Acceleration factorB) Retention factorc) Both acceleration and retention factord) None of the mentioned
B
4. What would immediately be used if your clothing caught fire or if a large chemical spill had occurred on your clothing? A) Fire extinguisher B) Safety shower C) Laboratory sinks D) Eye-wash fountain
B
5. Similar to dichloromethane (DCM), Diethyl ether (d=0.714g/mL) can also be used to extract caffeine from aqueous tea. Which layer will be at the top of separatory funnel when you mix aqueous tea and diethyl ether? A) Aqueous layer B) Diethyl ether layer C) There won't be two layers D) Hard to tell
B
6. In the extraction experiment, sodium carbonate is used for better extraction. What else we can use? A) CH3COOH B) NaHCO3 C) NaCl D) CaCO3
B
8. The following 1,2 diol undergoes pinacol type of rearrangement in acid. Predict the product. ----------------> ? A) B) C) D) None of those
B
8. What is common in the following chromatographic techniques? TLC, Column chromatography, GC, HPLC A) Mobile phase B) Stationary phase C) Supporting materials D) Detection equipment
B
Which one is not used as safety equipment or material? [A] Fire extinguisher [B] flammable materials [C] blanket [D] bucket of sand
B
1. Below is the structure of caffeine: Three nitrogen atoms present in the caffeine structure are in form of: A) 10 B) 20 C) 30 D) 40
C
1. If you are given a solid phenolic organic compounds and you are asked to do (a) chemical tests, what you will do? A) add a reagent, 2,4-DNPH B) add a reagent bisulfite C) add a reagent Ferric chloride D) add a reagent Tollens-s reagent
C
1. There are two unlabeled bottles in the lab but we know one contains pinacol and the other contains pinacolone. How can you figure out which one is which? Find out the incorrect answer: A) by taking IR spectra B) by their physical state C) by taking Visible spectra D) by taking chemical test
C
10. The conversion of pinacol to pinacolone takes place faster because of A) Acid catalyst only B) Heat only C) Both catalyst and heat D) None of those
C
2. The principle on which thin layer chromatography is based is that the ____________ (Hints: Check the bold wording) A) Different compounds are absorbed on an absorbent to different degreesB) Different compounds are absorbed on an absorbent to same degreesC) Different compounds are adsorbed on an adsorbent to different degreesD) Different compounds are absorbed on an absorbent to same degrees
C
3. In the extraction of caffeine experiment, how can you tell that you have got absolutely pure caffeine? A) from color B) from b.p. C) from m.p. D) from solubility
C
4. Select the incorrect statement from the following option. a) Every pure solid crystalline substance has a characteristic and unique melting pointb) Impure sample of substance has different melting pointc) Two different pure substances have same melting pointsd) Melting point serves as the criteria of purity of a solid substance
C
4. The functional group of pinacol and pinacolone can be described as following: A) 10 alcohol and ketone B) 20 alcohol and ketone C) 30 alcohol and ketone D) alcohol and ketone
C
5. Estimate the pH of liquid left in the reacting round flask in the pinacol experiment after distillation. A) pH=7 B) pH=much higher than 7 C) pH= much lower than 7 D) Can't be predicted
C
5. What should be the very last function performed in the lab before you leave?* A) Bid the instructor farewell B) Make sure that your locker is secure C) Wash your hands D) Arrange a time with your lab partner for lunch
C
6. After performing a TLC experiment, a researcher determines the Rf value of a component to be 2. He also notes that the solvent travelled a distance of 4cm on the plate. What can you conclude about this experiment? A) The component travelled a distance of 8cm B) The solvent is not volatile C) The reported data does not seem valid D) There are multiple components in the mixture
C
6. Boiling chips are put into the distillation flask to avoid ____________ a) Overheatingb) Uniform boilingc) Bumping of the solutiond) None of the mentioned options
C
6. Eating and drinking is not permitted in the lab because:* A) There would not be enough time to finish the experiment B) The stockroom serves terrible appetizers C) You could be poisoned D) The lab would become quite messy with this type of activity
C
6. Which molecule has a polar covalent bond? A) NaF B) KF C) HF D) F2
C
7. See the developed tlc plate on the right: How many total compounds are there? A) 1 B) 2 C) 3 D) 4
C
7. Which molecule has a net dipole moment zero? A) CH3Cl B) CH2Cl2 C) CHCl3 D) CCl4
C
7. Which of the following extraction processes used in the caffeine experiment? A) Solid phase extraction B) Solid liquid extraction C) Liquid liquid extraction D) Acid base extraction
C
8. In a vacuum distillation, substance boils at a/an a) exact temperature of the b.p. of the substance b) temperature slightly above b.p. c) temperature below its b.p. d) high pressure
C
8. Which best describes why water is polar? A) Water is covalent B) Water is linear molecule C) Water is bent molecule D) Water has no lone pair in its central atom
C
9. If a substances decomposes when heated to its boiling point, the suitable method is a) simple distillation b) fractional distillation c) vacuum distillation d) crystallization
C
9. Of the following common organic solvents, which one has a smallest dipole moment, if any? A) Acetone ((CH3)3C=O) B) Alcohol (CH3CH2-OH) C) Cyclohexane (C6H12) D) Acetic acid (CH3COOH)
C
10. Caffeine has both amine and amide functional groups
True
10. Non-polar molecules can contain polar bonds.
True
10. Safety always comes first
True
8. Caffeine is basic heterocyclic organic compound
True
4. Which of the following processes leads to the absorption of infrared radiation by a molecule? A) bond vibration B) nuclear spin flip C) bond breaking D) electron excitation
A
5. Predict the solubility of well know drug, amphetamine (see below) in acid or base. A) soluble in acid B) soluble in base
A
2. A sample begins to melt at 78 °C and is completely melted at 80 °C. The melting point of this sample is characterized by a) The range of the initial temperature and the final temperature (e.g.,78-80 °C). b) The final temperature at which the sample is completely melted (e.g.80 °C). c) The temperature halfway between initial temperature and the final temperature (e.g.,79 °C). d) The initial temperature at which the sample starts to melt (e.g.,78°C).
A
2. Predict whether the following pair of liquids would be miscible or immiscible? Petroleum ether and alcohol A) Miscible B) Immiscible
A
1. Predict whether the following pair of liquids would be miscible or immiscible? Benzene and dichloromethane A) Miscible B) Immiscible
A
10. Which of the following is not applicable to thin layer chromatography? A) Rf value B) solvent front C) polarity D) triple point
D
2. Below is the structure of caffeine: Carefully examine the structure and tell how many total lone pair(s) of electron in the structure; A) 2 pairs B) 4 pairs C) 6 pairs D) 8 pairs
D
2. If you are given a liquid aldehyde organic compounds and you are asked to do a chemical tests, what you will do? A) add a reagent, 2,4-DNPH B) add a reagent bisulfite C) add a reagent Ferric chloride D) add a reagent Tollens-s reagent
D
3. The eluent filled in the closed jar is ____________ A) Mixture of gasesB) Mixture of a liquid and a gasC) Mixture of solidsD) Mixture of liquids
D
3. The following drying agent can be used to dry pinacolone after separation from water. A) Na2SO4 B) Na2SO3 C) Anhydrous Na2SO3 D) Anhydrous Na2SO4
D
3. Which one of the following statements about the melting point of a compound is true? a) The melting point of an impure compound is the same as that of a pure compound. b) How the melting point of an impure substance compares to that of the same purified c) The melting point of an impure compound is higher than that of a pure compound. d)The melting point of an impure compound is lower than that of a pure compound
D
4. Which of the following plants contains the most caffeine?A) Robusta coffee beansB) Arabica coffee beansC) Cocoa nutsD) Tea leaves
D
5. The following is a IR spectrum of an organic compound. This spectrum indicates: A) Carboxylic acid B) Alcohol C) aldehyde D) Ketone
D
6. What is the IUPAC name of pinacolone? A) 3.3,3 -trimethylpropa-2-one B) Methyl tert.butyl ketone C) tert.Butyl methyl ketone D) None of those
D
7. The following symbol represents: A) Corrosive B) Radioactive C) Great danger D) Biohazard
D
7. Which of the following is not separated through distillation process? a) Acetone and waterb) Aniline and chloroformc) Impurities in Sea waterd) Milk and water
D
8. The following glassware represents: A) A Flask B) A Glass container C) An Erlenmeyer flask D) A Graduated Erlenmeyer flask
D
9. TLC plates separate molecules on the basis of: A) Color B) Bond orientation C) Size D) Polarity
D
9. The following is the mechanism of pinacol to pinacolone. There are 5 structures from pinacol (left, structure-1) to pinacolone(structure-5). Which structure is supposed to show resonance? A) Structure-1(pinacol) B) Structure-2 C) Structure-3 D) Structure-4
D
9. Acidification of caffeine makes it less soluble in water.
False
9. You can drink if necessary but no eating in chemistry lab
False
