Organic Chemistry Questions

Give the IUPAC name for the following compound fr select select select

O Na Ott e 2 CH Br 3 Na Oft 4 CH CH Br 5 H O 6 name product name final prods

react 3 1 cycloperity nexanoic name iupac acid with

De Select one 08 18 Nuclear Change 1 Question 8 Which of the following describes what occurs in the fission process 61 O A heavy nucleus is fragmented into lighter ones A neutron is split into a neutron and proton O Two light nuclei are combined into a heavier one O O A proton is split into three quarks A particle and anti particle appear in an area of high energy density

De Select one a De Nuclear Change 1 Question 10 What is true about strong nuclear force De O O It can happen between neutrons and protons two protons or two neutrons It has near infinite range It happens only between charged particles It is the force that keeps electrons in orbit around the nucleus

When benzaldehyde is treated with sodium borohydride subsequent aqueous work up followed by the reaction with Jones reagent the resultant product is phenylethanol phenylacetic acid benzoic acid Phenol Joohel O

What Etu type OF 0 IS reaction this Oft Base Et 0 O

6 6 pts For each reaction predict what mechanism will account for the major product s formed and write SN1 SN2 or N R in the boxes provided Explanations or drawings are NOT required a b C OH xo HOCH 3 NaOH H O 7 9 pts Provide the missing reagents to complete the reactions below more than one step may be required Be sure to indicate the amount needed of any reagents if necessary OH

CHM 2010 Fall 2021 7 4 pts Determine the max number of possible stereoisomers based on the structure below show work for full credit O OH Br A 8 6 pts Utilizing the boxes below rank the following structures in order of increasing stability Max number of stereoisomers x B X C

Give the IUPAC name for the following compound select select STAL

1 Select one 1 Nuclear Change 1 Question 3 What is the missing product from the fusion of hydrogen H H ie 1 O H O H O He O H

Sample Problem Gaseous phosphorus pentachloride decomposes to chlorine gas and gaseous phosphorus trichloride as shown in the balanced chemical equation PCI PCIx0 Clx In a certain experiment at a temperature where K 8 96 x 102 the equilibrium concentrations of PCL and PCI were found to be 6 70 x 10 M and 0 300 M respectively Calculate the concentration of Cl present at equilibrium 1

For the given carboxylic acids which one is expected to be have higher pka Explain the reason based the concepts such as stability and equilibrium OH HO O OH

3 What is percentage concentration of solution if in 600 ml of the water are dissolved 32 5 g of solid Fe NO2 3

53 Calculate the enthalpy change for the reaction P4O6 s 20 8 P4O10 s given the following enthalpies of reaction P s 30 8 P O6 3 Alf Pa s 50 8 5O2 8 P4O10 s P4O 0 s AH All 1640 1 kJ AH 2940 1 kJ

In the sun two hydrogen atoms fuse into one helium atom How does this process produce energy Select one 1 O Two hydrogen atoms have one more proton than a helium atom This proton becomes energy Two hydrogen atoms have two more electrons than a helium atom These electrons become energy A helium atom has slightly more mass than two hydrogen atoms This mass difference becomes energy A helium atom has slightly less mass than two hydrogen atoms The mass difference becomes energy

What can be done to reduce your carbon footprint and why is reducing it important

Suppose that for the reaction N g 3Cl 8 2NC13 8 it is determined that at a particular tempera ture the equilibrium concentrations are 0 000201 M anc N 0 000104 M Cl NC13 0 141 M Calculate the value of K for the reaction at this temperature

18 Write K expressions for each of the following equilibrium reactions If necessary do the problem on a separate sheet of paper and insert a photo of it in the designated space a b c d 2NaHCO s NaCO s CO 2 H O g

hy are solids and liquids not included i e equilibrium expression

Consider the structure of diamond and graphite Graphite contains two types of distance between adjacent carbon atoms The distance between C atoms in same layer is x while the distance between C atoms in adjacent layers is y Diamond contains only one type of carbon carbon bond with a bond length of z Which of the following is correct Ox y z O z y x Oy x z Oy z x

In the following flow chart P1 P2 P3 P4 represent appropriate products of the indicated step Which molecule is not among P1 P2 P3 and P4 O 1 NaBH 2 H 0 P1 OH OH OH Kotbu P2 MCPBA P3 1 PhBr Mg ether 2 H 0 P4

1 Indicate all formal charges in the following molecules 12points CH CH3 H C CH C CH CH H3N CH H C o 0 CH3 H H C HC CH3 QH

3 3 Draw resonance structures for the following 15 points d e h CH3

4 Draw the keto tautomer of each of the following enols 10 points OH LOH

Chemistry Of the following molecules contains the most energy CH3OH CH2O CO2 CH4 CHOH

7 a Write a detailed mechanism using arrows to explain only two of the following 10 points d CI CH COONa NaOEt heat 8 8

14 What do the square brackets in the equilibrium expression indicate

2 Indicate the direction of the polarity for each of the bonds indicated except for all carbon to carbon bonds 8 points Br Mg C H CH3 HS F CH N H H NO

a Write a detailed mechanism using arrows to explain only two of the following 10 points 7 a Write a detailed mechanism using arrows to explain only two of the following 10 points Br uv CC14 Br Bri 1 I

What is the product of the following sequence of reactions Br S Mg ether to OH or 1 2 H 0 H CrO 4 Product

Williamsons Ether synthesis method may be used to prepare this ether phenyl 1 methylcyclohexyl ether benzylphenylether di t butyl ether Odiphenyl ether

Which reagent may not be involved in the following multistep conversion HO KMnO4 strong NaOH heat O3 in THF followed by Zn HCI OPCC OH

Dimensional Analysis 2 Molar Concepts Question 5 Select one How many moles of C2H2 are contained in 26 04 grams of C2H2 0 50 mo 2 00 mol 1 50 mol 1 00 mole 319 19 Mn Kay ilma 400 2823hzale 201 Boala

8 The structure of the compound is shown below was found to be biologically active Answer the following questions pertaining to the structure below 20 points CH3 HN 010 H 0 O H 0 CH H CH3 a Draw a line structure from the given Kekule structure on the right b Identify and label three functional groups in the structure c Indicate two nucleophilic nu sites in the structure d Indicate two electrophilic sites el in the structure d Identify any all chiral center s with an e Draw below a pair of diasteriomers of the compound What is the relationship between the two compounds that you drew Are they enantiomers or diasteriomers of each other Will a 50 50 mixture of them rotate plane polarized light in the structire

Predict the major product of the following elimination reaction CH7 OA B OC OD Br A 4 OH B C D

6 Complete the following reaction scheme 60 points 4 points each a Br2 hv

Precisely 0 50 moles of HCl is mixed with 20 liters of water What is the concentration of the resulting solution Select one a 2 5 M b 5 0 M C 0 25 M d Not enough information provided

b c 5 Draw the most stable conformer of each of the following 15 points Use Newman projections for straight chain compound and chair for cyclic compounds 3 4 dimethyhexane when viewed through C 3

3 3 Draw resonance structures for the following 15 points a HCO HC b CH CH CH CH3

Choose the best answer for each of the following questions Equal volumes of ideal gases contain the same number of molecules provided the gases have equal masses O pressures O temperatures O temperatures and pressures

1 10 Select one Dimensional Analysis 2 Molar Concepts Question 4 Nitrogen gas has the following chemical formula N 1 How many molecules are 8 8 grams of nitrogen gas 1 89 x 1023 3 78 x 1023 14 01 x 1023 6 02 x 1023 10 n 32 aja HENENDE wall paid we A4 PIEDBE B Pati H Periodic Table of the Elements T Dies size m SA Julz 21 2 81 181 272 BENE Ara HE last 18 18 a FE INC HAN POST vis lil agrop 11 2131 7 H aoult valtalain tt titt alia 15 za Dima 2 0 tall Titit BAPA PER ban Glid 1 15 een lea MAMA bl les te CM2218 CC BY S

Question 3 Provide the missing structure reagents for the following reactions 1 2 3 4 5 La O 1 LIAIH 2 H O 1 2 CH3MgBr 2 H O C KMnO4 H O heat NH COOH

In the month of August your electric bill was 145 68 What is the hourly cost of electricity in your home The hourly cost for August was cents per hour Round to 5 decimal places I

10 What mass of NaOH is required to react exactly with 25 0 mL of 1 2 M H SO4 a 1 2 g b 1 8 g 2 4 g 3 5 g c d 11 Consider the reaction between 15 0 mL of a 1 00 M aqueous solution of AgNO and 10 0 mL of a 1 00 M aqueous solution of K CrO4 When these react a precipitate is observed What is present in solution after the reaction is complete Note the solid is not considered to be in solution a Ag NO K CrO2 water b Ag NOy K water c K CrO2 water d NO K CrO2 water 12 With what volume of 5 0 M HF will 7 4 g of calcium hydroxide react completely according to the reaction 2HF Ca OH 2 CaF2 2H O 1

CHM 2010 1 9 pts On the line drawn below provide the systematic IUPAC name for the following structure Be sure to include stereochemistry R S cis trans or E Z when appropriate Show all work for full credit Br H 2 5 pts Clearly label below each compound whether it is the acid base conjugate acid or conjugate base Then using pka values in the table given determine which way the equilibrium will favor and redraw the equilibrium arrow in the box provided H O NH4 H3O NH3

d 14 28 4 What is the ratio of a Potassium K atoms to oxygen O atoms in the ionic compound K 0 5 In a Chemistry lab the directions might say pipette 1 10 of the 250 ml solution into another beaker Show the expression needed to calculate how much solution to transfer to the second beaker 6 Use cross multiplication to determine if the two fractions are equal 15 34 72 170 7 Solve for x in the following proportion 3 x 19 38

14 New concept cars in the Detroit Auto Show feature engines that burn hydrogen gas in air to produce water vapor Suppose that fuel tank contains 150 L of H gas at 20 0 atm pressure at 25 C If all of this gas is burned what mass of water vapor is produced Write a balanced chemical equation for the reaction Given Unknown

What is the major contributing resonance structure HO SO Il O III S HO S O all of these structures contribute equally HO

Select one F Dimensional Analysis 2 Molar Concepts Question 9 Which represents the greatest mass of carbon O 1 gram of carbon 1 mole of carbon 1 atom of carbon 1 molecule of carbon