Organic Chemistry Questions

In order to effect the transformation shown the reagents needed are CH3 CH3 OH OH Cat Os04 TMANO acetone H20 AgOAc 12 H2O ACOH Cat K20s2 OH 4 DHQD 2PHAL CINANTS t BuOH H20 TiO i Pr 4 t BuOOH DET

3 An unknown metal with a mass of 5 23 g absorbed 47 17 J of heat energy and underwer a temperature change of 10 K What is the specific heat of the metal

True False The major diastereomer produced in this reaction is A HE True False DMDO A THE H B www

Which statement is UNTRUE O Double diastereoselection involves a chiral substrate and a chiral reagent In double diastereoselection a mismatched pair leads to very high levels of diastereoselection O In substrate controlled diastereoselection only the substrate is chiral not the reagent In reagent controlled diastereoselection only the reagent is chiral not the substrate

A person reacts 136 98g of water with 158 74g of carbon dioxide according to the reaction below What volume in liters of oxygen gas would form if the pressure in the reaction vessel at 2atm and the temperature is 100 C Reaction 6CO2 g 6H O g C6H12O6 1 902 g

34 5L of carbon dioxide gas at 1atm and 200 C is reacted with excess water What mass of glucose C6H12O6 would be formed Reaction 6CO2 g 6H O g C6H12O6 902 g

9 Identify each of the following as part of the primary secondary tertiary or quaternary structure of a protein a Hydrogen bonds form beta sheets b Amino acids join through peptide bonds to make a polypeptide c Several different polypeptides form a single biologically active protein d Polar side chains are attracted by aqueous parts of the surroundings while nonpolar side chains are repelled This causes the protein to form into a specific three dimensional shape e The polypeptide coils into a stabilized helix because of hydrogen bonds that occur between the first and fourth amino acid groups

In the previous question which is the limiting reactant Iron Metal Aluminum Metal O Iron III Oxide Oxygen Gas O Aluminum Oxide

Observe this picture and choose the correct statement A B O When combined B might be found in oils O When combined B might be found in cholesterol O Uncombined B might be found in fats

In order for a male to inherit a sex linked X linked disorder he must receive the allele from his mother only his father only both his mother and father either his mother or father

what is the multiplicity that can ve expected for the signal of the next proton Cu l es la multiplicidad que se puede esperar para la se al del siguiente prot n H3C a Doblete d b Singlete s C Cuartete q d Triplete t OH H

Calcium chloride CaCl Magnesium sulfate Mg SO Calcium Sulfate Ca SO Magnesium Chloride MgCl

Question 1 0 25 pts A person has a sample of nitrogen gas at 23 91 C and a pressure of 2 68atm If the sample has a volume of 32 45L how many particles in moles of nitrogen gas are present

Identify the nature of the aromatic ring in nitrobenzene O The ring is neither activated nor deactivated towards electrophilic aromatic substitution relative to benzene O The ring is strongly activated towards electrophilic aromatic substitution relative to benzene The ring is strongly deactivated towards electrophilic aromatic substitution relative to benzene Submit Request Answer

pply 7 Use Percentages Given that the molecular mass of magnesium hydroxide Mg OH is 58 32 amu and the atomic mass of an atom of oxygen is 15 999 amu what percentage of this compound is oxygen

Compare the two reactions A and B shown below Check all the statements that are TRUE regarding the epoxide products B DMDO X 8 1 i The epoxide from A is not optically active The epoxide from A is optically active The epoxide from A is enantiomerically enriched The epoxide from B is racemic The epoxide from B is enantiomerically enriched The epoxide from B is optically active The epoxide from A is racemic The epoxide from B is not optically active go

Design some molecules that would act like soap but will not form insoluble salts in hard water

Which one of the following is the repeating unit of the polymer formed in the polymerization of para hydroxybenzoic acid fot 604 to 0 Structure B O Structure D Structure C Structure A B 1 008 D S

Consider the following electron configurations to answer the questions that follow i 15 2s2 2p 3s1 ii 1s 2s 2p 3s2 iii 1s2 2s2 2p 3s2 3p iv 152 252 2p6 352 3p4 v 152 2s2 2p 3s2 3p5 The electron configuration belonging to the atom with the highest second ionization energy is

6a Draw the structure of PC15 7a Draw the structure of Br3 8a Draw the structure of SbF5 9a Draw the structure of BC13 10 Draw the structure of CO3 6b How many single double and triple bonds are there 7b How many single double and triple bonds are there 8b How many single double and triple bonds are there 9b How many single double and triple bonds are there 10b How many single double and triple bonds are there

10 What is the frequency of light s 1 that has a wavelength of 3 12 10 3 cm A 3 69 B 2 44 x 1016 C 9 62 1012 D 4 10 x 10 17 E 1 04 x 10 13

SO can react with OH forming HSO3 In this reaction O the OH ion acts as a Lewis base donating an electron pair to the SO2 molecule to form a coordinate covalent bond O the SO2 acts as a Lewis acid accepting a proton from the OH ion O the OH ion acts as a Br nsted base donating a proton to the SO2 molecule O the SO2 acts as a Br nsted acid accepting a proton from the OH ion the OH ion acts as a Lewis acid accepting an electron pair from the SQ molecule to form a coordinato cour

Consider an aqueous solution of each of the following Which solution should be the most acidic Click to open O Ga NO aq O Al NO aq O Hg NO3 aq O Ca NO3 aq O Zn NO aq

Given the following atoms and ions Xe Cs TI 3 1 Ba Te correctly list the six atoms in order of increasing size smallest to largest smallest

The four isomeric dimethylcyclopropanes are shown below Which of the selected pairs has structures that are related as enanteomers Me Me H 11 OI and III O II and IV OII and III I and IV Me Me Me Me H Mo III H H IV Me

A solution of potassium nitrate is prepared by mixing 3 50 g of KNO3 with 12 0 g of water The percent by mass of KNO3 is Click to open O 23 3 22 6 O 29 2 41 8 28 0

What is the steveochemical relationship between the following compounds OH They are enantiomers HO 11 They are identical not isomers They are different conformations of the same compound They are constitutional isomers They are diastereomers

Which of the following structures represents bicyclo 4 2 0 octane Structure I Structure III O Structure V IV O Structure IV Structure II 111

Which of the following is a diastereomer of 2R 3R 2 3 dibromopentane O R 1 2 dibromopentane O 25 35 2 3 dibromopentane O 25 3R 2 3 dibromopentane O 2R4R 2 4 dibromopentane

Which of the following cycloalkanes can adopt a conformation that hap zero angle strain and zero torsional strain O Cyclobutane O Cyclohexane O Cyclooctane Cyclopropane

For the reaction 3B C DE 2F initial rate measurements were carried out and data for three rums are shown below Rate mol L 1 Experiment B 1 0 100 rate k B C rate k B C O rate k B C O rate k B C 2 rate k B C 0 200 0 100 C 0 250 0 250 0 500 The rate law for this reaction is therefore 0 000250 0 000500 0 00100

How many signals in the H NMR spectrum should be observed for the following compound Cu ntas se ales en el espectro de RMN H deben ser observadas para el siguiente compues H3C O a 1 O b 3 H

Which of the four Fischer projections corresponds to the compound shown on the left below Hint Determine the absolute stereochemistry at each stereocenter H C O Structure O Structure II Structure IV CH H OH H B CH 1 H Br CH OH H CH HO CH H H Br CH 111 CH HO H Br H N

What is the wavelength of light nm that has a frequency of 6 44 1013 s A 4660 B 6490 C 4 66 10 8 D 6 49 10 8 E 932

A buffer solution is prepared by taking 0 400 moles of acetic acid HC H O pK 4 76 and 0 250 moles of sodium acetate C H O Na in sufficient water to make 1 400 liters of solution Calculate the pH of this solution Click to open Click to open O 4 96 O4 86 O 4 46 O 4 56 O 4 66

If a reaction involving a single reactant is first order with a rate constant of 4 50 x 102 s how much time is required for 75 0 of the initial quantity of reactant to be used up Click to open 11 6 seconds 30 9 seconds 25 3 seconds 16 7 seconds O 23 1 seconds

Sulfuric acid Lithium hydroxide 2 Hexene hydrobromic acid and light 1 Butene bromine and light E

Ethane nitrile with LiAIBr water 1 2 3 Propantiol with undecanoic acid

3 methylcyclohexene 4 carboxaldehyde is formed from a Diels alder rxn Draw the two starting materials in the correct orientation to form this product O H

The relative concentrations of ATP and AMP control the cellular rates of O oxidative phosphorylation all of the above O citric acid cycle O glycolysis O pynivate oxidation

In high school it is common for children of the rich to flaunt their affluence with nifty clothing and expensive gadgets meant to provoke the envy of their schoolmates This type of behavior is called Conspicuous consumption invidious consumption O conspicuous compassion O prestige seeking

Which of the following statements is true A Chemical shift is a quantitative measure in NMR B Sometimes MS can produce a M 1 peak C H 2 or deuterium is NMR inactive D Chromatography is an analytical tool not for the preparation purpose

A 0 300 M solution of an acid HZ has a pH 1 301 What is the value of the ionization constant K for this acid Click to open 07 14 x 100 O 2 00 x 10 O 1 00 x 102 O 1 67 101 8 33 x 103

1 Balance each of the following chemical equations by adding the correct coefficients in front of each substance a A b Na Al Cl c NaOH d f e F h AI CIO3 3 i CaCO3 4 H O Sb 05 Hf N Ca AIO 2 CH H SO4 1 AICI 1 CH4 0 NaOH H AICI3 0 CaO HCI Na SO4 SbF5 0 CO Hf3N4 AICI CaCl CO H O CO H O H O H O

Suppose the reaction A B D followed the mechanism A B C fast CD slow The rate law for the reaction is therefore O rate k A rate k A B D rate k A B C rate k A B O rate k A

ww 160 5 mol of an ideal gas is at 1 47 atm at 47 70 C what is the volume of the ga

Identify the following structures F F T I C C T F F H C H n n H3C CH H LAX n HH T B

FICIF H C H FICIF n J 0 H3C CH 11 H H H n H H

Name the following compounds by any correct name Make sure to show the numbers for the group locations DO NOT mix common names and systematic names CH3 CH CH CH3 CH3 CH3 NO

Exercise 3 Rewrite the following sentences and put the adverb of frequency in the appropriate place 1 Have you been to Paris ever 2 I play tennis on Fridays usually 3 My mother doesn t get up before 10 00 normally 4 I go to the gym once a week 5 My father watches football games hardly ever 6 I sleep until noon sometimes 7 The school bus arrives at half past seven always 8 Do you lift weights in the morning often 9 I exercise at night because I go to bed early never 10 We go to Istanbul two times a year