Question 1

Explain how soap removes dirt from clothes.

Accepted Answer

The hydrophobic end dissolves

Question 2

How could you synthesize stearolic acid,CH3(CH2)7C≡C(CH2)7COOH from oleic acid,CH3(CH2)7CH=CH(CH2)7COOH? Specify stoichiometric details,providing a brief explanation of your rationale.

Accepted Answer

@#IMG-DLM& Oleic acid needs to be protected in the

Question 3

Which type of phosphatide contains the structural unit shown below?

Accepted Answer

A) Cephalins 
B) Phosphatidyl serines 
C) Plasmalogens 
D) Lecithins 
E) Both plasmalogens and lecithins 
A) Cephalins 
B) Phosphatidyl serines 
C) Plasmalogens 
D) Lecithins 
E) Both plasmalogens and lecithins

Question 4

Which is an untrue statement concerning cholesterol?

Accepted Answer

A) Cholesterol decolorizes a solution of Br2 in CCl4. 
B) Cholesterol reacts with 2,4-dinitrophenylhydrazine. 
C) Cholesterol is optically active. 
D) Cholesterol is water-insoluble. 
E) Cholesterol reacts with H2/Pd 
A) Cholesterol decolorizes a solution of Br2 in CCl4. 
B) Cholesterol reacts with 2,4-dinitrophenylhydrazine. 
C) Cholesterol is optically active. 
D) Cholesterol is water-insoluble. 
E) Cholesterol reacts with H2/Pd

Question 5

Saturated fatty acids pack efficiently.Therefore the corresponding triacylglycerols tend to be ___ at room temperature and are called ___.

Accepted Answer

The answer of Saturated fatty acids pack efficiently.Therefore the corresponding...

Question 6

What product would be obtained by catalytic hydrogenation of 5-cholesten-3$\beta$-ol?

Accepted Answer

A) 5$\beta$-Cholestan-3$\beta$-ol 
B) 5$\beta$-Cholestan-3$\beta$-ol. 
C) 5$\infty$-Cholestan-3$\infty$-ol 
D) 5$\beta$-Cholestan-3$\infty$-ol 
E) 5-Cholesten-3$\beta$,6$\infty$-diol 
A) 5$\beta$-Cholestan-3$\beta$-ol 
B) 5$\beta$-Cholestan-3$\beta$-ol. 
C) 5$\infty$-Cholestan-3$\infty$-ol 
D) 5$\beta$-Cholestan-3$\infty$-ol 
E) 5-Cholesten-3$\beta$,6$\infty$-diol

Question 7

Which of the following could be used to prepare stearic acid,CH3(CH2)16COOH?

Accepted Answer

A) CH3(CH2)15CH2Br,CN-,heat; then H3O+,heat 
B) CH3(CH2)15CH2Br,Mg,(C2H5)2O; then HCHO; then H3O+ 
C) CH3(CH2)16CH2Br,NaOH; then KMnO4,OH-,H2O; then H3O+ 
D) CH3(CH2)15CH2Br,CN-,heat; then H3O+,heat and CH3(CH2)15CH2Br,Mg,(C2H5)2O; then HCHO; then H3O+ 
E) CH3(CH2)15CH2Br,CN-,heat; then H3O+,heat and CH3(CH2)16CH2Br,NaOH; then KMnO4,OH-,H2O; then H3O+ 
A) CH3(CH2)15CH2Br,CN-,heat; then H3O+,heat 
B) CH3(CH2)15CH2Br,Mg,(C2H5)2O; then HCHO; then H3O+ 
C) CH3(CH2)16CH2Br,NaOH; then KMnO4,OH-,H2O; then H3O+ 
D) CH3(CH2)15CH2Br,CN-,heat; then H3O+,heat and CH3(CH2)15CH2Br,Mg,(C2H5)2O; then HCHO; then H3O+ 
E) CH3(CH2)15CH2Br,CN-,heat; then H3O+,heat and CH3(CH2)16CH2Br,NaOH; then KMnO4,OH-,H2O; then H3O+

Question 8

What products would you expect from reaction of estradiol with these reagents?
a)NaH,then CH3I
b)CH3COCl,pyridine
c)Br2,FeBr3
d)PCC in CH2Cl2

Accepted Answer

Question 9

Fats can be either optically active or inactive,depending on their structure.Draw the structure of an optically active fat that yields 2 equiv.of stearic acid and 1 equiv.of oleic acid on hydrolysis.Draw the structure of an optically inactive fat that yields the same products.

Accepted Answer

The answer of Fats can be either optically active or...

Question 10

What of the following will fill properly the blanks in the sentence. Lipids are classified according to ___,and they include ___ structural types.

Accepted Answer

A) their structure; two 
B) their melting temperature; fats and oils. 
C) their melting point; triglycerides and phospholipids. 
D) the physical operation done to isolate them; a variety of 
E) their structure; only terpene and steroid. 
A) their structure; two 
B) their melting temperature; fats and oils. 
C) their melting point; triglycerides and phospholipids. 
D) the physical operation done to isolate them; a variety of 
E) their structure; only terpene and steroid.

Question 11

What would be the product of the following reaction sequence?

Accepted Answer

A) CH3(CH2)5CH=CH(CH2)14CH3 
B) CH3(CH2)5COOCH2(CH2)14CH3  and CH3(CH2)5CH=CH(CH2)7COOCH2(CH2)14CH3 
C) CH3(CH2)14COOCH2(CH2)14CH3 
D) CH3(CH2)13CHClCOOCH2(CH2)14CH3 
E) CH3(CH2)5CH=CH(CH2)7COOCH2(CH2)14CH3 
A) CH3(CH2)5CH=CH(CH2)14CH3 
B) CH3(CH2)5COOCH2(CH2)14CH3  and CH3(CH2)5CH=CH(CH2)7COOCH2(CH2)14CH3 
C) CH3(CH2)14COOCH2(CH2)14CH3 
D) CH3(CH2)13CHClCOOCH2(CH2)14CH3 
E) CH3(CH2)5CH=CH(CH2)7COOCH2(CH2)14CH3

Question 12

How could you convert an unsaturated fatty acid into a saturated fatty acid?

Accepted Answer

A) KMnO4,OH-,heat 
B) OH-,H2O,heat; then H3O+ 
C) H2,Ni,pressure 
D) H3O+,H2O,heat 
E) O3; then Zn,HOAc 
A) KMnO4,OH-,heat 
B) OH-,H2O,heat; then H3O+ 
C) H2,Ni,pressure 
D) H3O+,H2O,heat 
E) O3; then Zn,HOAc

Question 13

Suggest a mechanism by which ψ-ionone is transformed into β-ionone on treatment with acid.

Accepted Answer

The answer of Suggest a mechanism by which ψ-ionone is...

Question 14

Prolonged heating of naturally occurring polyunsaturated fats may cause the stereochemistry of the double bonds to change from ___.

Accepted Answer

The answer of Prolonged heating of naturally occurring polyunsaturated fats...

Question 15

Suggest a reasonable synthetic strategy for the synthesis of N,N-dimethylstearamide,CH3(CH2)16CON(CH3)2 from oleic acid,cis-9-octadecenoic acid

Accepted Answer

i)H₂,Ni; ii

Question 16

Which of these is a male sex hormone?

Accepted Answer

A) Estrone 
B) Cholic acid 
C) Testosterone 
D) Cortisone 
E) Estradiol 
A) Estrone 
B) Cholic acid 
C) Testosterone 
D) Cortisone 
E) Estradiol

Question 17

Which is an untrue statement concerning the fatty acid moieties of naturally occurring triacylglycerols?

Accepted Answer

A) Generally,they possess an even number of carbon atoms. 
B) Most have unbranched carbon chains. 
C) The double bonds,when present,all are in the cis configuration. 
D) Where two or three double bonds are present in the same fatty acid moiety,they comprise a conjugated system. 
E) The fatty acid moieties in a particular triacylglycerol usually are different. 
A) Generally,they possess an even number of carbon atoms. 
B) Most have unbranched carbon chains. 
C) The double bonds,when present,all are in the cis configuration. 
D) Where two or three double bonds are present in the same fatty acid moiety,they comprise a conjugated system. 
E) The fatty acid moieties in a particular triacylglycerol usually are different.

Question 18

Which of the following might be helpful in distinguishing between oleic acid and linoleic acid?

Accepted Answer

A) Examine the stoichiometry of the reaction with NaOH/H2O 
B) Examine the stoichiometry of complete catalytic hydrogenation. 
C) Examine products obtained after subjecting the sample to catalytic hydrogenation 
D) Examine products obtained after subjecting the sample to: i)O3,CH2Cl2; ii)Zn,CH3CO2H 
E) Two of these choices. 
A) Examine the stoichiometry of the reaction with NaOH/H2O 
B) Examine the stoichiometry of complete catalytic hydrogenation. 
C) Examine products obtained after subjecting the sample to catalytic hydrogenation 
D) Examine products obtained after subjecting the sample to: i)O3,CH2Cl2; ii)Zn,CH3CO2H 
E) Two of these choices.

Question 19

How many isoprene units are in vitamin A?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) More than 4 
A) 1 
B) 2 
C) 3 
D) 4 
E) More than 4

Question 20

Which of the following characteristics are found in the class of C20 carboxylic acids called prostaglandins?

Accepted Answer

A) A five membered ring 
B) One or more double bonds 
C) Several oxygen containing groups 
D) Two of the above 
E) All of these choices 
A) A five membered ring 
B) One or more double bonds 
C) Several oxygen containing groups 
D) Two of the above 
E) All of these choices

Exam 23: Lipids

Explain how soap removes dirt from clothes.

How could you synthesize stearolic acid,CH3(CH2)7C≡C(CH2)7COOH from oleic acid,CH3(CH2)7CH=CH(CH2)7COOH? Specify stoichiometric details,providing a brief explanation of your rationale.

Which type of phosphatide contains the structural unit shown below?

Which is an untrue statement concerning cholesterol?

Saturated fatty acids pack efficiently.Therefore the corresponding triacylglycerols tend to be ___ at room temperature and are called ___.

What product would be obtained by catalytic hydrogenation of 5-cholesten-3 β\betaβ -ol?

Which of the following could be used to prepare stearic acid,CH3(CH2)16COOH?

What products would you expect from reaction of estradiol with these reagents? a)NaH,then CH3I b)CH3COCl,pyridine c)Br2,FeBr3 d)PCC in CH2Cl2

Fats can be either optically active or inactive,depending on their structure.Draw the structure of an optically active fat that yields 2 equiv.of stearic acid and 1 equiv.of oleic acid on hydrolysis.Draw the structure of an optically inactive fat that yields the same products.

What of the following will fill properly the blanks in the sentence. Lipids are classified according to ___,and they include ___ structural types.

What would be the product of the following reaction sequence?

How could you convert an unsaturated fatty acid into a saturated fatty acid?

Suggest a mechanism by which ψ-ionone is transformed into β-ionone on treatment with acid.

Prolonged heating of naturally occurring polyunsaturated fats may cause the stereochemistry of the double bonds to change from ___.

Suggest a reasonable synthetic strategy for the synthesis of N,N-dimethylstearamide,CH3(CH2)16CON(CH3)2 from oleic acid,cis-9-octadecenoic acid

Which of these is a male sex hormone?

Which is an untrue statement concerning the fatty acid moieties of naturally occurring triacylglycerols?

Which of the following might be helpful in distinguishing between oleic acid and linoleic acid?

How many isoprene units are in vitamin A?

Which of the following characteristics are found in the class of C20 carboxylic acids called prostaglandins?

The Basics

Families of Carbon

Acids and Bases

Nomenclature and Conformations of Alkanes and Cycloalkanes

Stereochemistry

Nucleophilic Reactions

Alkenes and Alkynes I

Alkenes and Alkynes II

Nuclear Magnetic Resonance and Mass Spectrometry

Radical Reactions

Alcohols and Ethers

Alcohols From Carbonyl Compounds

Conjugated Unsaturated Systems

Aromatic Compounds

Reactions of Aromatic Compounds

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Reactions at the Α Carbon of Carbonyl Compounds

Condensation and Conjugate Addition Reactions of Carbonyl Compounds

Amines

Transition Metal Complexes

Carbohydrates

Amino Acids and Proteins

Nucleic Acids and Protein Synthesis

Filters

How could you synthesize stearolic acid,CH₃(CH₂)₇C≡C(CH₂)₇COOH from oleic acid,CH₃(CH₂)₇CH=CH(CH₂)₇COOH? Specify stoichiometric details,providing a brief explanation of your rationale.

Saturated fatty acids pack efficiently.Therefore the corresponding triacylglycerols tend to be _ at room temperature and are called _.

What product would be obtained by catalytic hydrogenation of 5-cholesten-3 $\beta$ -ol?

Which of the following could be used to prepare stearic acid,CH₃(CH₂)₁₆COOH?

What products would you expect from reaction of estradiol with these reagents? a)NaH,then CH₃I b)CH₃COCl,pyridine c)Br₂,FeBr₃ d)PCC in CH₂Cl₂

What of the following will fill properly the blanks in the sentence. Lipids are classified according to _,and they include _ structural types.

Suggest a reasonable synthetic strategy for the synthesis of N,N-dimethylstearamide,CH₃(CH₂)₁₆CON(CH₃)₂ from oleic acid,cis-9-octadecenoic acid

Which of the following characteristics are found in the class of C₂₀ carboxylic acids called prostaglandins?