Organic Chemistry Questions

Atomic Structure 2 Electronic Structure Question 2 Read the statement lect one A hypothetical ionic compound has the following formula AB2 Which option shows the most likely periodic table groups for the elements A and B O A Group 2 B Group 17 O A Group 2 B Group 18 O A Group 1 B Group 18 OA Group 1 B Group 17

Which compound will give the following compound when mixed with sodium ethoxide in ethanol G eto eto eto eto eto eto me eto etO

Which of the following is a strong electrolyte O AgNO3 O NH3 OC H O HF O O O

Draw all the possible products of the following reaction octo Br CH OH

The following reaction then occurred 3H g N g 2NH3 g The equilibrium concentrations are NH3 g 0 80 M H g 2 8M N g 1 6M The value for K for the formation of ammonia is a 0 018 Ob 0 047 O c 55 d 8 8 e 0 18

Would you expect cyclohexane C H to be miscible with water Explain why or why not

a 2 b 4 c 5 d 6 6 Which of the following is not both a Bronsted Lowry acid and a Bronsted b H PO4 c HCO3 d H3O a HSO4 7 Which of the following compounds is a Lewis base a Hg2 b AlCl3 C CN d B OH 3 What is the conjugate acid of H C6H5O7 is a 6H5O73 b HC6H5O72 C H3C6H5O7 d H C6H5O7 Which of these salts would form an acidic aqueous solution h KCl NaNO c CrCl d NaBrO

13 Consider a compound RR C OH X Identify X if the compound is hemiacetal a CN B NH C OH d OCH 14 Which of the following is product of the reaction of propanal with NH NHC H a imine b Shiff s base c phenylhydrazone d gem diol

A 17 10 g compound is made up of 5 900 g N and 11 20 g C What is the percent composition of carbon in this compound Your answer should have four significant figures

Q 3 Dentistry 0 4p each correct answer 1 Which of the following pair has dipole dipole forces d 1 H O a H S NH b CO CS c CCl4 H 2 Which of the following can form hydrogen bonds with HF d C H5OH a CH F b Na c C6H6 3 pH of certain orange juice is 3 What is the H concentration a 10 1 b 10 2 c 10 d 10 11 4 Identify the strongest base b Kb 103 Group a Kb 10 c Kb 10 d Kb 1011 5 Which of the following is the van t Hoff s factor for 2M of calcium bromide a 2 d 6 b 4 c 5

7 What is the product of the reaction of 1 mol methyl bromide with 1 mol benzene CH3Br C6H6 a 1 bromo 2 methylcyclohaxa 3 5 diene b 5 bromo 6 methylcyclohaxa 1 3 diene c Bromobenzene d methylbenzene 8 Which catalyst is used in the reaction of benzene with ethyl bromide a FeCl b FeBr c AICI d HgSO4 9 Which statement is correct about the effect of the substituent groups on the strength of alcohols electron withdrawing groups decrease acidity by stabilizing the conjugate base b electron withdrawing groups increase acidity by stabilizing the conjugate base c electron withdrawing groups decrease acidity because they destabilize the conjugate base d electron withdrawing groups increase acidity because they destabilize the conjugate base

Ozone decomposes to oxygen according to the equation 203 g 302 g Select the equation that relates rate of O3 in terms of the rate of formation of O2 a rate 03 Ob rate 03 Oc rate 03 Od rate 03 O e rate 03 rate 0 rate O 2 rate 02 3 rate O rate O

A 1 0L flask contains 2 0 mol of A and no products at 298K Determine the equilibrium concentration of C Given the reaction A g B g 20 g Kc 8 33 10 4 Hint Prepare an ICE table to solve this problem and watch out for coefficients You may assume the change is concentration is negligible small x assumption a 0 094 M Ob 0 24 M Oc 5 6 x 10 M O d 0 15 M O e 0 075 M

Given the below reaction aA bB cC dD The means Oa the reaction is impossible Ob the reaction is slow O c the reaction can go in the forward or reverse directic O d the reaction is fast

Which of the following is true for a system whose equilibrium constant is relatively large a It will take a short time to reach equilibrium O b It will take a long time to reach equilibrium Oc The equilibrium lies to the left d The equilibrium lies to the right

Which of the below diagrams would represent the catalyzed reaction when compared to the uncatalyzed reaction diagram baker Energy kJ O b 04 50 45 40 35 30 25 20 15 10 5 0 Energy kJ Energy kJ Energy kJ 50 45 40 35 30 25 20 15 10 5 0 2458425950 35 30 15 10 50 H 45 40 35 30 Extent of reaction Extent of reaction A Extent of reaction

Which energy difference represents the forward activation energy of the reaction Energy O a A Ob B Odc A B C D Progress of Reaction A

If the equilibrium constant Kc for A B 2C is 0 500 What is the equilibrium constant for 2A 2B 4C is O a 0 500 Ob 1 00 Oc 0 707 Od 0 250

Indicate the mass action expression for the following reaction X g Y g 2W g V g O a 2W V x y O b XY w v Oc W v X Y Od X Y W V O e W V X Y

d dbromonitrobenzene 6 Which of the following is NOT true about delocalized molecular orbitals in benzene a interaction of the unhybridized 2p orbitals in benzene leads to the formation of delocalized molecular orbitals b delocalized molecular orbitals are not confined between two adjacent bonding atoms c delocalized molecular orbitals actually extend over three or more atoms melay d electrons residing in any of these orbitals are not free to move around the benzene ring

If 10 0 moles of Al2O3 are reacted per the below reaction how many moles of oxygen gas are produced a 15 0 b 6 7 Oc 3 0 d 30 0 O e 6 0 2Al2O3 1 4Al s 30 g 4

rst classify each of the following reactions as one of the five types introduced in this lab ombination decomposition single replacement double replacement or combustion Second write e balanced chemical equation for each reaction H2Oz aq H2O O2 g SO3 g H O 1 Mg s AgNO3 aq C H g O g CO g MgCO3 s MgO s Na O s H O l Na s H O l 2 C3H8O3 1 Br 1 P4 S O g Nal aq Br 1 H SO4 aq Combination Mg NO3 2 aq 2 Ag s Single replacement CO g NaOH aq NaOH aq CO g NaBr aq PBr3 s H O g H g H O g I s

What is the pH of a solution with an H of 1 0 x 10 M 01 3 O 11

At max how many electrons are in an s sublevel 02 06 O 10 O 14 4

Under certain conditions the decomposition of ammonia on a metal surface gives the following data NH3 M 1 0 x 10 32 0x 10 3 3 0 x 10 Rate M h 1 5 x 10 61 5 x 10 61 5 x 10 6 Determine the reaction order with respect to NH3 a 0 Ob 1 Oc 2 Od 3

24Mg and 24Mg2 are Oions isotopes different elements isoelectronic

A reaction is at equilibrium when a all motion stops b the concentration of the reactants is equal to the concentration of the the products Oc the limiting reactant has been completely consumed d the rate of the forward reaction is equal to the rate of the reverse reaction

What happens at the equivalence point in an acid base titration the pH of the solution is 1 the indicator is most colorful there is an equal amount of moles of acid and base the indicator has changed color

cyanohydrine oxime gem diol d hemiacetal 14 Consider a compound RR C OH X Identify X if the compound is cyanohydrin a NH b CN OH d OR 25 What is the product of the reaction of propanal with HCN a CH CH CH N OH b CH CH CHEN NH CH CH CH OH CN CH CH CH N CH a b

What is the H concentration for a solution that has a pH of 10 4 1 02 M 3 98 x 10 11 M 1 04 x 10 1 M 1 02 M

2 Calculate the theoretical mass percentage of potassium chloride in potassium chlorate Show all steps include measurement units and follow the significant digits convention

Which dissolves NaCl more quickly hot water or cold water Explain W

18 What is the outcome of the reaction acetic anhydride with CH3OH a acetic acid and methyl ethanoate formic and acetic acids b c only ethanol d acetic acid and ethyl methanoate

Which dissolves more quickly fine or course NaCl crystals Explain why

Compound Benzoic acid Vanillin Mandelic acid trans Cinnamic acid Urea Functional groups Structures acid CooH COOH Aldehyel hydroxyl ether hydroxyl acid Cary amine ketone Ho O Au TOCF13 OH AN M N C NH i do OH

Given the following reaction at equilibrium 4NH g 50 g 4NO g 6H O g According to Le Chatelier s principle what will happen to reaction if ammonia NH gas is added to the system O a More oxygen will be produced Ob The value of the equilibrium constant will be changed Oc The equilibrium would shift to the products right Od The equilibrium would shift to the reactants left e No change

Transmittance 4000 3500 3026 41 3000 2919 89 2500 Unknown 5 2000 Wavenumbers cm 1 1603 94 1459 46 1494 40 1500 1029 95 1080 64 1000 02 38

10 Which of the following is a major product of the dehydration reaction of 3 methylpentan 2 ol a 3 methylpent 1 en 2 ol b 3 methylpent 2 en 2 ol c 3 methylpent 1 ene d 3 methylpent 2 ene 11 Which of the following alkohols is the strongest acid a R COH b R CHOH c RCH OH 12 Finish the reaction a C H OK H b C H K 0 c C H OK H O d C H K H O C H OH KOH d CH OH

4 Which of the following is alkyne b C H a C H c C H d C H 2 5 Which of the following is NOT true about delocalized molecular orbitals in benzene a interaction of the unhybridized 2p orbitals in benzene leads to the formation of delocalized molecular orbital b delocalized molecular orbitals are confined between two adjacent bonding atoms c delocalized molecular orbitals actually extend over three or more atoms d electrons residing in any of these orbitals are free to move around the benzene ring 6 What is the product of the reaction of 1 mol bromine with 1 mol benzene Br CH 1 2 dibromocyclohaxa 3 5 diene 5 6 dibromocyclohaxa 1 3 diene a b c Bromobenzene d 1 1 dibromobenzene

15 Which of the following is product of reaction of propanone with excess ethanol a gem diol b acetal chemiacetal d oxime 16 Write the formula of the product of the reaction of 3 3 dimethylpentanal with hydroxylamine a NH CH CH OH C CH CH CHO b CH CH C CH CH C N NH C CH CH C CH CH C N OH d CH CH C CH CH CH OH NH

3 Which of the following are the products of the following reaction CH Cl Cl a CH Cl b CCl H c CC HCI d CHCI HCI 4 Use Markovnikov s Rule to predict which is major product in the following reaction pent 1 ene HBr c 2 bromopentane d 2 bromopent 1 ene a 1 bromopent 1 ene b 1 bromopentane

Classify carbon monoxide CO as an element compound or mixture element compound mixture

1 What is the IUPAC name for the structure shown below a 1 1 1 trimethylpentane b 1 1 1 trimethylbutane 2 General formula for alkynes is expressed by a CnH2n 2 b C Hzn 3 Which of the following is alkane a C H b CH O CH CH C CH CH CH CH c 2 2 dimethylpentane d 2 2 dimethylbutane C CHzna c CH14 Pentine d C H 2 d C H10

Two atoms with the following symbols are 18 9X 13 6X different elements isotopes Oions the same element and isotope the same element

What is the mass number for the following isotope How many neutrons does the following element have 345 34 18 neutrons 34 34 neutrons 34 16 neutrons O16 16 neutrons

Which functional group s would be added to 1 methylcyclohexene using the reagents below Br H O ketone and aldehyde hydrogen bromine and hydrogen bromine and hydroxyl ketone hydrogen and hydroxyl Obromine hydroxyl aldehyde

17 What is the outcome of the reaction carboxylic acid with alcohol a amide b alcohol ester d anhydride 18 Following compound is named as a N N dimethylformamide c N N methylformamide CHO NIC CH C N CH b N N dimethylacetamamid N N methylacetamamide

CI Br 3 Dr Goodchem s Graduate Student Jonathan reacted 2 bromo 2 methylbutane with a very strong base Draw the reaction showing the starting material and the products Circle the major product and give an explanation for your prediction

How many electrons does the species represented by the following symbol have 50Sn4 118 O 50 O 46 O 54 68

Calculate the theoretical mass percentage of oxygen in potassium chlorate KC1O3 Show all steps include measurement units and follow the significant digits convention