Chapter 1, Problem 1.21E

Which one of the following statements explain why protecting groups are referred to as “a necessary evil in organic synthesis”?   Question 12Select one or more:   A. They increase the length and cost of the synthesis       B. Every synthesis employs protecting groups       C. Protecting group have no role to play in a synthesis     D. They minimize the formation of side products

Which of the following attributes is a key advantage of the chiral auxiliary approach over the chiral pool approach in asymmetric synthesis?   Question 10Select one:   A. Chiral auxiliaries are cheaper than chiral pool substrates     B. Chiral auxiliary can be recovered and recycled unlike chiral pool substrates.     C. The use of chiral auxiliaries provide enantiopure products, while chiral pool reactions are only enantioselective       D. The chiral auxiliaries are naturally occurring and do not require synthesis

In the following molecule, indicate the hybridization and shape of the indicated atoms. CH3 CH3 H3C HO: CI:

Which of the following are TRUE about linear syntheses?   Question 7Select one:   A. They are easier to execute     B. They are the most efficient strategy for all syntheses       C. They are generally shorter than convergent syntheses       D. They are less versatile compared to convergent syntheses

Which of the following characteristics is common among chiral pool substrates?       Question 4Select one:   A. They have good leaving groups     B. They are all achiral     C. All have a multiplicity of chiral centres       D. They have poor leaving groups

Determine whether the following reaction is an example of a nucleophilic substitution reaction: H NO2 H+ NO 2 + Molecule A Molecule B Is this a nucleophilic substitution reaction? If this is a nucleophilic substitution reaction, answer the remaining questions in this table. What word or two-word phrase is used to describe the role Molecule A plays in this reaction? What word or two-word phrase is used to describe the role Molecule B plays in this reaction? Use a 6 + symbol to label the electrophilic carbon that is attacked during the substitution. Highlight the leaving group on the appropriate reactant. O Yes ○ No ☐ 0 dx 000 HE ?

Draw the major organic product of the Bronsted acid-base reaction. Include all lone pairs and charges as appropriate. Ignore any counterions. :0: NaOH H

5. Calculate the total amount of heat transferred as 50 g of wat Specific heat H₂O (g) 2.00 J/g°C -10 °C. Specific heat H₂O (1) Specific heat H₂O (s) 4.18 J/g°C 2.11 J/g°C Heat of vaporization 2260 J/g Heat of fusion 334 J/g Melting point 0°C 6. Calculate the total amount of heat transferred as 25 g of water is heated from 50 °C to 100 °C as a gas. Boiling point 100 °C

Calculate the total amount of heat transferred as 50 g of Water -10°C. Calculate the total amount of heat transferred as 25 g of water is heated from 50°C to 100°C as a gas. \table[[Specific heat H₂O(g), 2.00°C Η 2 g 5. Calculate the total amount of heat transferred as 50 g of wat Specific heat H₂O (g) 2.00 J/g°C -10 °C. 4.18 J/g°C 2.11 J/g°C 2260 J/g 334 J/g Specific heat H₂O (1) Specific heat H₂O (s) Heat of vaporization Heat of fusion Melting point 6. Calculate the total amount of heat transferred as 25 g of water is heated from 50 °C to 100 °C as a gas. Boiling point 100 °C 0°C