Organic Chemistry Questions

An element is composed of a mixture of two isotopes In every sample there is 75 77 of element with a mass of 34 97 amu and 24 23 of the element with a mass of 36 97 amu The average atomic mass of this element is 1 35 45 amu 2 34 97 amu 3 36 97 amu 4 36 49 amu 5 35 83 amu

Student 1 Density 0 998 g mL Student 2 Density 0 996 g mL Student 3 Density 0 996 g mL The actual density of water at 25 C equal 0 997 g mL What do the results of these three experiments demonstrate when compared to the true density of water 1 High accuracy and high precision 2 High accuracy and low precision 3 Low accuracy and high precision 4 Low accuracy and low precision

A 20 g sample of calcium carbonate decomposes in a flame to produce carbon dioxide gas and 11 2 g of calcium oxide How much carbon dioxide was released in the decomposition 1 0 2 g O2 20 g 3 11 2 g 4 28 8 g 5 8 8 g

Deduce the identity of the following compound from the H NMR data given C3H6Br2 2 4 ppm 2H quintet 3 5 ppm 4H triplet A CH3 2CHOCH3 B BrCH2CH2CN C BrCH2CH2CH2Br D CH3 3CCHO OA DE

A buffer solution that is 0 466 M in HCIO and 0 466 M in NaClO has a pH of 7 46 The addition of 0 01 mol of OH to 1 0 L of this buffer would cause the pH to The capacity of this buffer for added H O could be increased by the addition of 0 141 mol

Which of the following compounds has the lowest C C stretching frequency cm A O A OB X OC B C X D E

The number of signals and their splitting in the H NMR spectrum of the molecule below is 3 signals 2 doublets and a septet 2 signals a doublet and a septet O3 signals a doublet a quartet and a septet O4 signals 2 doublets a singlet and a septet 3 signals a singlet a doublet and a septet

If a molecule contains 4 elements of unsaturation degree of unsaturation and H NMR peaks are between 7 0 8 0 ppm what structural group is likely to be present carbonyl group O hydroxyl group cyclohexyl ring aromatic ring

What does the intensity or integration of a signal in the H NMR spectrum represent how many different types of protons are present how many protons of each type are present the electronic structure of the molecule close to each type of proton O how many neighboring protons are present

Predict the number of signals peaks expected in the H NMR spectrum of the compound shown below ignore splitting H3C 3 04 05 OCH3 CH3

Which of the indicated bonds would be expected to show IR peak H CH3 C C HAH A H CEC H O A only OB only O Both A and B O Neither A nor B B

The IR spectra below corresponds to which molecule wavelength um 4 4 5 5 5 5 6 2 5 100 80 60 40 20 4000 A O A OB STRANSMITTANOW OC C 3500 LOH 3 5 3000 B m 2500 CH O CH3 C C CH3 H C H H 2000 1800 1600 1400 1200 1000 wavenumber cm C OH CH 10 11 12 13 14 15 16 D CH CH OH E 800 600 CH C N

Which of these is an appropriate H NMR solvent A CHCl3 B C6H6 O A OB OC C CD3CN D CH3COCD3

The symbol for blue atoms is BI the symbol for orange atoms is Or a 1 Blue molecule and 2 Orange atoms react to form 1 Blue Orange molecule Select one Which chemical equation represents the reaction O Bl Or2 Bl Or2 O 2BI 20r 2BIOr O Bl 20r Bl Or 2BI Or2 2BIOr

A student measures the mass of a 1 00 g aluminum rod as 0 99 g The best estimate of the percent error associated with this measurement is

Calculate the number of moles of Li PO in 2 2 L o 4 0 60 M LI PO solution 4

Br KNO H SO 2 4 H KNO H SO Br Lo 4 NO 2 NO

If Kc for the reaction 4HCI g O2 2Cl2 g 2H2O g is 135 calculate Kc for the reaction Cl2 g H O g 2HCl g 1 2O2 g There are four decimals in th answer

Which compound s would be expected to show IR absorption at 3300 cm 1 A B CH3CH2C CHD O A OB OC CH3C CCH3 C

Calculate E for the cell below using the correct half reactions Fe 2 2e Fe E 0 440 Would this cell be spontaneous as written Zn 2 aq 2Fe 2 aq 2Fe 3 aq Zn s Cell potential to two decimal places Spontaneous yes or no Fe 3 1e Fe 2 EO 0 771 Zn 2 2e Zn E 0 763

The major product of the following reaction i AICI 26 CI

The major product of the following reaction is on AICI 0 26 CI

Which of the following is benzophenone O C6H5 CO C6H5 O CoHs CHO O C6H5 C6H4 OH C6H5 CO CH3

a iservation of Mass Question 4 Which equation is correctly balanced for hydrogen and oxygen reacting to form water Select one 2H O 2H O O 4H O 2H O O H 0 H O H O H O

The major product of the following reaction is O O AICI o ob as ar CI

How do the CONCENTRATIONS of reactant and product compare in an equilibrium reaction equal concentrations of reactant and product are present in all equilibrium reactions only reactant is present in all equilibrium reactions only product is present in all equilibrium reactions some product and some reactant is present in all equilibrium reactions

When the following flow chart of reaction is completed the major product is H PO4 A 1 B H THF H O NaOH 2 6 PCC 1 PhBr Mg ether 2 H O

What is the product of the following sequence of reactions A O A OD 0 B Br Fe Br OH h Mg Ether Q3 B OH C 1 0 2 H O OH D OH

Which of the following is an important reactive electrophile in aromatic nitration NO O NO O NO O NO2

Which description explains this figure Br O Alkyl bromides can be converted into alkanes O Markovnikov addition of HBr is taking place O Anti Markovnikov addition of HBr is taking place O Bromination is expected to take place

Select one 1 Nitric oxide Oxygen If 60 0 g of nitric oxide reacts with 36 0 g of oxygen how much nitrogen dioxide is produced 1 O 96 0 g O 36 0 g O 60 0 g O 24 0 g Nitrogen dioxide

The major product of the following reaction is AICI 06 08 CI A

What is the major product for the following reaction a Hg OAc 2 EtOH b NaB H4 NaOH

What would be the major product of the following reaction sequence 1 Br hv 2 H O oo 00

Which of the following species is not a resonance form of the species A B

What is the major product for the following reaction a O CH Cl 78 b Meys HCHO

What is the major product of the following reaction sequence 1 H Lindlars catalyst 2 B CC1 enantiomer enantiomer

Provide the product resulting from the following reaction A Br B

Provide the starting materials for the following Williamson Ether Synthesis reaction Alkyl halide Di A B Alkoxide Br Br Na O toNa O Na

What is the major product for the following reaction sequence la NaNH NH liq 1b CH CH CH Br 2 H excess Pd C

g 8 ino Balance these equations H FeCl2 s C H g NaHCO3 s NaOH aq 0 H O O2 g H O Na CO3 MgCl2 aq FeO s CO2 g V CO2 g NaCl aq HCl aq H O 1 V H O g Mg OH 2 s

GER 1 3 3 Al s Fe aq Al aq Fe s Half reaction Fe aq 2e Fe s Al aq 2e Al s Standard Reduction Potentia 0 771 1 660

HO HO Reactants H 2 Opia 2 H O g Products HO 00

2 What is the concentration of H3O in a solution with OH 1 10 12 M Is the solution acidic or basic

Given the electrochemical reaction shown if the standard reduction potential of Ni2 Ni is 0 26 V and the standard reduction potential of Al Al is 1 66V what is E for the following Al Al aq Ni 2 aq Ni E V

Ca OH 2 H SO4 CaSO4 H O SIC i Write the Balanced chemical equation Ca OH 2 H SO4 CaSO4 2 H O ii iii UN 2 add 2 Given 5 moles of Ca OH 2 how many moles of H O will be obtained Show work for full credit If you are provided with 50 g of Ca OH 2 how many grams of H O will you obtain Show each step of your calculation for credit 2 What is the concentration of H3O in a solution with OH 1 10 12 M Is the solution acidic or basic

Please answer the following questions in detail Points will be given for the steps shown where applicable just providing the final answer will not get any points 1 Given the equation Ca OH 2 H SO4 CaSO4 H O i ii iii Write the Balanced chemical equation Given 5 moles of Ca OH 2 how many moles of H O will be obtained Show work for full credit If you are provided with 50 g of Ca OH 2 how many grams of H O will you obtain Show each step of your calculation for credit 2 What is the concentration of H3O in a solution with OH 1 x 10 12 M Is the solution acidic or basic 3 A gas sample in a closed expandable container of initial volume 5 00 L was allowed to warm from 25 C w ma Hints Bl

5 Provide the answers for the following nuclear equations i 232U 92 ii in 22Th He 90 17N 16

4 What is the IUPAC name of this compounds ii Compound CH3 CH2 CH2 CH2 CH2 CH2 CH3 5 Provide the answers for the following nuclear equations i 232U B 92 iii CH CH CH CH CH CH CH CH 22Th He 90 17N Name

Which ONE of the following reagents would be best suited to detect the presence of an important Cysteine on the cell surface of a protein Carboxypeptidase A Streptavidin