4. Omit the questions on p. 10-3 of the 262 lab manual. Answer the following questions...

4. Omit the questions on p. 10-3 of the 262 lab manual. Answer the following questions instead.
a) A research paper describes that a photochemical reaction takes place in a quartz vessel but not in a Pyrex vessel. Rationalize this observation.
b) Why does the benzopinacol precipitate from the reaction mixture even though it is a diol?
c) What is the purpose of washing with 95% ethanol?
d) The acid-catalyzed rearrangement of benzopinacol to benzopinacolone is irreversible. Explain.

Expert Solution

a ) The photochemical light having shorter wawelenght ( < 200 cm^-1) have a high energy sufficient to breck covalent bonds.If we use pyrex vessel it cannot withstand to such aa energy & will be brocken down.For the stability of pyrex vessel the waveleght required is above 200 cm^-1 .The quartz vessel is stable to such photochemicals energy & therefore used in photochemical reaction.

b ) the light is absorbed & passed through pinacolon mixture without initiating the reaction & hence the measurable conversion is less & therefore precipitated out.

c ) The most of the impurities in the precipitates are dissolved in 95 % ethanol & we get pure precipitates.

d) The protonation of hydroxyl group by acid makes leaving group & expel oit as water. The one of the phenyl group is the transfered to electron deficient carbon atom makinf C-O double bond.& hence reaction is irreversible.

queen_honey_blossom answered 3 months ago

4. Complete the table below, using Figure 1-3 in your lab manual for reference. Structure Body...

4. Complete the table below, using Figure 1-3 in your lab manual for reference. Structure Body Region Head Cephalic Neck Chest Armpit Humerus/Arm Anterior Surface of Elbow Radius and Ulna (forearm) Wrist Hand Abdomen Lower back Buttocks Hip Pelvis Groin Femur/thigh Back of knee Anterior leg Posterior leg/calf Ankle Foot Sole of foot

Question 4 (3 + 4 + 3 = 10 p.) As a new macroeconomic expert at...

Question 4 (3 + 4 + 3 = 10 p.) As a new macroeconomic expert at the Central bank, you are asked to answer the following questions: a) Why does a Central bank not have complete control over the size of the money supply? Give two reasons. b) Assume that the inflation rates over three time periods are 1 percent, 2 percent, and 4 percent. Nominal interest rates in the same three periods are 5 percent, 5 percent, and 6...

Exp 24 Report Sheet This is the equivalent of p. 297-298 in your lab manual, but...

Exp 24 Report Sheet This is the equivalent of p. 297-298 in your lab manual, but easier to read. Be sure to identify the three unknowns at the bottom of page 2. Physical Properties of Hydrocarbons Solubility: Indicate if the substance is soluble or insoluble in water and ligroin. Does this indicate that the substance is polar or non-polar? Density: Is the substance more dense than water (sinks) or less dense than water (floats). For ligroin, can you tell anything...

In the lab manual you are required to keep a 2 – 3 mm layer of...

In the lab manual you are required to keep a 2 – 3 mm layer of acetone and then add water. A student vaporized the acetone absolutely and state that he can use the residue for the later measurement. What is the biggest defect of doing this comparing to the correct procedure? How the calculated yield and measured boiling range will be affected? Experiment 4: Extraction of an Antibiotic Introduction The extraction of compounds from plant and animal sources is...

1. Answer the following questions: A) On April 30, 2020, Connie borrowed P 185,000 at 10%...

1. Answer the following questions: A) On April 30, 2020, Connie borrowed P 185,000 at 10% compounded monthly. The loan is to be paid out in 90 equal monthly payments with the first payment on May 31, 2020. What is the size of each monthly payment? B) Cocoy wants to accumulate P 230,000 in 9.5 years. Equal deposits are made at the end of each quarter in an account that pays 15% compounded quarterly. What is the size of each...

Q. 4. In the following questions choose the most appropriate answer. (10 m) . The buyer...

Q. 4. In the following questions choose the most appropriate answer. (10 m) . The buyer purchases at his own risk. This doctrine is called a.Novation b.Caveat emptor c.Anticipatory breach of contract d.None of the above A sale of goods by Mumbai businessman to his customer in Delhi will be subject to- a.Delhi VAT b.Mumbai VAT c.Maharashtra VAT d.Central Sales Tax A chartered Accounts is liable to collect from his clients- a.Excise duty b.Service Tax c.VAT d.GST In case of...

groups 4 provide a 3-4 paragraph answer for the following questions 1-What are 4 key things you...

groups 4 provide a 3-4 paragraph answer for the following questions 1-What are 4 key things you learned about the topic from reading their paper? 2-How does the topic relate to you and your current or past job? 3-Critique the paper in terms of the organization and quality. Many companies are searching for ways that entice their employees to be more productive at work. These companies are hoping employees will want to come to the workplace rather than working remotely with...

. For the following demand function, QD = 100 – P, answer the following questions a....

. For the following demand function, QD = 100 – P, answer the following questions a. what is the point elasticity of demand at P = 80? b. what is the point elasticity of demand at P = 20? c. at what price is demand unitary price elastic? d. demand is price elastic for prices between __________ and ___________ e. Consider your answer to part d., what happens to revenues as prices decrease within this range? Are marginal revenues positive,...

These questions are based on the Synthesis of Methyl Orange lab using p-Sulfobenzeneazo-4-dimethylaniline sodium salt. 1....

These questions are based on the Synthesis of Methyl Orange lab using p-Sulfobenzeneazo-4-dimethylaniline sodium salt. 1. What is the need of adding NaOH during coupling reaction (here)? Write necessary equation. 2. Based on pKa of MO (3 4), what will be the color of MO in regular water? 3. Identify active electrophile(s) and nucleophile(s) during coupling reaction with necessary structures.

Use the following information to answer Questions 6 and 7. The 1-, 2-, 3-, and 4-year...

Use the following information to answer Questions 6 and 7. The 1-, 2-, 3-, and 4-year oil forward prices are $60, $58.35, $57.40, and $55 per barrel, respectively. Your firm is thinking about starting up an offshore drilling station and needs to forecast revenue over the next 4 years. Assume the risk-free rate is 5.25% each year and initial costs are $150,000,000. 6. (1 point) If your firm expects to extract 1,100,000 barrels of oil per year and each barrel...

Question