Organic Chemistry Questions

knoevenage Chemicals Benzaldehyde NaOH solid P anisaldehyde ethanol malonitrile OF EN EN EtOH Aldol Condensation Benzaldehyde NaOH solid p anisaldehyde

Which substance will have the highest boiling point a CCl4 b CF4 Oc CBI4

When a liquid is placed into a capillary tube the contents of the tube are pushed down It follows that the relative strength of the attractive forces is Ocohesive forces are stronger than adhesive forces adhesive forces and cohesive forces are the same strength So venr

Write bond line formulas for the following a cis 3 Octene b trans 2 Hexene c 2 4 Dimethyl 2 pentene d trans 1 Chlorobut 2 ene e 4 5 Dibromo 1 pentene f g 3 4 Dimethylcyclopentene h Vinylcyclopentane i 1 2 Dichlorocyclohexene j trans 1 4 Dichloro 2 pentene 1 Bromo 2 methyl 1 prop 2 en 1 yl cyclopentane

Question 30 2 Choose the correct base to produce this regiochemistry 1 Base 2 CH31 OLDA BuOH NaOMe

Which substance will have the highest boiling point a CC14 Ob CF4 Oc CBI4

Aldehydes and ketones react with one molecule of an alcohol to form compounds called hemiacetals in which there is one hydroxyl group and one ether like group Reaction of a hemiacetal with a second molecule of alcohol gives an acetal and a molecule of water ROH H W OH OR Aldehyde ketone OH ROH H Draw the structural formulas for the hemiacetal and the acetal formed between the following compounds Alcohol OR OR H O You do not have to consider stereochemistry Use separate sketchers for the hemiacetal and the acetal Draw the hemiacetal in the left sketcher and the acetal in the right sketcher sign for the dropdown menu Separate the two sketchers using the

What are the strongest intermolecular forces in CH3OH Oion dipole forces hydrogen bonds O covalent bonds O dipole dip le forces London forces

15 51 Compare the structures of ethylene acetylene and benzene Each of these compounds produces only one signal in its H NMR spec trum Arrange these signals in order of increasing chemical shift H H H H H H

Draw the reactant you would use to make the epoxide shown using a Sharpless epoxidation with t BuOOH and Diethyl tartrate B D Consider E Z stereochemistry of alkenes You do not have to explicitly draw H atoms Do not show stereochemistry in other cases In cases where there is more than one answer just draw one H OH

During many organic syntheses it is a common practice to introduce a silyl ether protecting group to mask the activity of an OH group In this example the silyl group chosen is the tert butyldimethylsilyl group Draw the product of the following transformation assuming that the tert butyldimethylsilyl Cl reagent reacts only once with the starting material M OH MO Use the we hash bond tools to indicate stereochemistry where it exists For your convenience the starting material has been drawn for you in the sketchpad OH CH3 H C C CH3 H3C SI CH3 CI Imidazole base DMF CH Cl2 Sn F K

t Draw curved arrows to show the movement of electrons in this step of the reaction mechanism of this epoxide rearrangement Arrow pushing Instructions 00 XT OH H SO4 THF HO 88

Pressure A C What phases are present at point E O Liquid only O Vapor only O Liquid and Vapor O Solid and Liquid O Solid and Vapor B F H Temperature I

Give the number of valence electrons for F

What is the specific gravity of chloroform when 63 67 mL of chloroform has a mass of 94 37g I I

What are the strongest intermolecular forces in SF dipole dipole forces hydrogen bonds Oion dipole forces O covalent bonds London forces

Which substance will have the highest vapor pressure a CF4 Ob CBr4 c CCl4

Aspirin has a density of 1 40 g cm What is the volume of an aspirin tablet in cm weighing 250 mg

What is the boiling point C of water on the top of Mount Everest where the atmospheric pressure is 255 0 torr AHvapH O 40 6 kJ mol normal boiling point H O 100 0 C Report your answer to 1 decimal place Your Answer

Complete the following unit conversion 6 991 105 g to kg

Which of the following is the MOST electronegative Cs F O Please just put in name as it appears here

What is the density in g ml of a sample that weighs 1 89 kg and occupies 4 980 mL I I

Draw the the structure of the following compounds a methoxypropane A dinvacuclohen FLORIS

5 1 punto What is the molarity of an aluminum acetate AI C H3O2 3 solution that has 0 333 moles dissolved in 0 250 liters 0 00774 M 1 2 M 0 75 M 1 33 M Anterior Sig

2 2 If you have 266 grams of Fe3O4 and 6 60 grams of H how many grams of water will be produced Mark only one oval 266g 1 58 9 grams of water 46 3 grams of water 82 8 grams of water 99 7 grams of water 99 HE X Joby 266g Imole 234 55 Am d

The Sharpless epoxidation is used when a single enantiomer product is required Predict the structure of the predominant product of the following transformation Si Ho H 8 H H OH Use the wedge hash bond tools to indicate stereochemistry where it exists For your convenience the starting material has been drawn for you in the sketchpad diethyl tartrate Ti O Pr 4 t butyl hydroperoxide 4 Sn 1

Which of the following is the LEAST electronegative Mg F O Please just put in name as it appears here

Mercury has a density of 13 6 g mL What is the mass of a 0 24L sample

What is the hybridization on the N atom in NH3

Identify the correct chair conformation of cyclohexane showing all the axial hydrogen atoms H H HI DI INC HHH HHH V HA SH H HH HH IV H H V

Given the following reactions 2NO N2 O2 2NO 022NO2 is the enthalpy of the reaction of nitrogen with oxygen to produce nitrogen dioxide 2N2 402 4NO2 AH 180 kJ AH 112 kJ kJ

Which of the following is the MOST electronegative Mg F O Please just put in name as it appears here

hemistry what is the product 2 2 CH3 1 NBS heat peroxide 3 CEN 3 Ha Pd C

O trigonal planar Otetrahedral

Substance X has a triple point of 5 2 atm and 57 C and a critical point of 72 8 atm and 31 1 C Under typical atmospheric conditions P 760 torr T 25 C solid X will a melt Ob boil c sublime d condense

p alkynylalcohols Starting with 3 5 hexadiyn 1 ol select reagents from the table below that should be used to synthesize 1 8 octanediol HO HO 3 5 hexadiyn 1 ol The reaction may require more than one step if so write the letters in the order that they are used e g abc If two or more ways conversion to the same product are possible show only one of them Omit steps that are part of the workup procedure 1 8 octanediol Reagents available a NaNH NH f TBDMS Cl b H Pt g Bu4N F c H Lindlar catalyst h Na NH3 liq d PCC i ethylene oxide e H O

Perform the following calculation and report your answer to the correct number of significant figures 62 41 5 36

Give the number of valence electrons for Oxygen

n 6 n 5 Express the frequency in inverse seconds AEO

In the reaction 6Na 2H3PO4 2Na3PO4 3H2 how many liters of hydrogen gas at STP are produced from 234 grams of sodium a b C d 2 13 liters H 113 95 liters H 448 21 liters H 1024 33 liters H

From the list of available starting materials select the reagents you would use to best prepare the following compound by a Williamson ether synthesis List your reagents by letter with no spaces or characters in between Example ao or oa OCH3 The reagents are Available Starting Materials a b ONa I i CH ONa CH ONa c 1 k Br ONa d CH ONa 1 CH Br Br e CH ONa g f CH Br n CH Br 0 Br ONa h P CH Br ONa Br

Choose which enantiomer of diethyl tartrate is used to prepare the epoxides shown using a Sharpless epoxidation H diethyl tartrate diethyl tartrate H O OH OH Try Another Version 2 item attempts remaining k

nn Arrow pushing Instructions H C CH H Ethylene glycol a common organic solvent and automotive antifreeze agent is synthesized by reaction of ethylene oxide in water with a sulfuric acid catalyst Write a detailed mechanism for this synthesis shown above Then draw curved arrows that depict electron reorganization for Step 1 of the mechanism shown below Unless specified otherwise do not count proton transfers when counting steps The starting materials of this step are provided XI H o H H H SO4 HOCH CH OH

Consider the Phase Diagram below Pressure A Liquid L 6 B Which is more dense the liquid or the solid H Temperature E A

Amines suitable for preparing buffers are often synthesized by treating ammonia with epoxides Consider the following series of reactions and draw the structure of compound B NH3 A B J A B C You do not have to consider stereochemistry

Direct alkylation OH LDA THF EtBr

0 az 4 U 8 L or a Az A B a 2 A az B bi A B A bi13

Arrow pushing Instructions MeOH Draw curved arrows to show the movement of electrons in this step of the reaction mechanism XT H SO4 OMe H3C OH

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Determine the polarity of SO2 Please type in the answer as either polar or nonpolar