Hydrocarbons Questions and Answers
Organic Chemistry
HydrocarbonsWhich statement about the chemical reactions of photosynthesis is true? SELECT ALL THAT
APPLY*
(5 Points)
they convert light energy into chemical energy
they are endothermic
they can be represented by 6CO2 +6H20 -->C6H12O6 + 602
Organic Chemistry
HydrocarbonsDetermine whether each reaction depends on a limiting reactant. Explain why or why not and identify the limiting reactant. (Select all that apply.)
(a) Potassium chlorate decomposes to form potassium chloride and oxygen.
Yes, one reactant is naturally limiting.
Yes, there are two reactants.
No, all reactants are in excess.
No, there is only one reactant.
potassium chlorate
Opotassium chloride
oxygen
Not enough information to identify which is the limiting reactant.
Organic Chemistry
HydrocarbonsA student was asked to calculate the mass of Ca(OH)2 needed to create 2.5 liters of 3.0 M aqueous solution. The student's work is below.
The student got the answer wrong. Identify the error, explain the mistake in detail and provide the correct calculation and answer.
Organic Chemistry
HydrocarbonsJose makes two mixtures. Mixture one contains 10 g of salt
dissolved in 50 mL of water. Mixture two contains 20 g of salt
dissolved in 50 mL of water. Compare the concentrations of the two
mixtures.
Select one:
a. The mixtures are of equal concentration.
b. Mixture two is more concentrated than mixture one.
c. Both mixtures are equally concentrated.
d. Mixture one is more concentrated than mixture two.
Organic Chemistry
HydrocarbonsBF, has various applications. One example is its use for producing adhesives. Given the chemical structure of BF,, would you expect it to be used as an adhesive to attach to polar or non-polar molecules? In formulating your answer, include the following information below: nuptry (shape) of d. Is BF, polar or non-polar? 3 termine f. Is water polar or non-polar? ng the e. Do you expect BF, to be water soluble? Why or why not?
Organic Chemistry
HydrocarbonsA clean strip of copper is dipped into a solution of magnesium sulfate. Predict what you might observe. (Hint: use activity series)
The copper becomes coated in magnesium.
The copper dissolves and the solution turns blue.
Bubbles appear as hydrogen gas is produced.
No reaction occurs.
Organic Chemistry
HydrocarbonsRank the following starting materials in order of increasing rate of reaction (slowest to fastest) in an
SN1 reaction:
3<1<2
1<2<3
2<3<1
1<3<2
2<1<3
Organic Chemistry
HydrocarbonsProvide the products and mechanisms for reactions a) and b). For c) provide the products only necessary to complete the synthesis. Indicate what mechanism was used for each product.
Organic Chemistry
HydrocarbonsPropose the structure of the following C10H12O2
IR band: peak at 1720 cm-¹
¹H NMR: triplet, 2.53 ppm, 2H
triplet, 2.85 ppm, 2H
singlet, 3.60 ppm, 3H
singlet, 7.19ppm, 1H
doublet, 7.23 ppm, 2H
doublet, 7.28 ppm, 2H
Organic Chemistry
HydrocarbonsRank the substrates below in order of increasing reactivity (from slowest to fastest) in a substitution reaction with KCN in DMSO. (Tos = tosylate)
1<3<2
3<2<1
2<3<1
3<1<2
1<2<3
Organic Chemistry
HydrocarbonsWhat is the organic product of the reaction between ethanol and ethanoic acid in the presence of
sulfuric acid?
A. CH3CHO
B. CH3COOCH3
C. CH3CH₂COOCH3
D. CH3COOCH₂CH3
Organic Chemistry
HydrocarbonsAs a result of the "leveling effect," the strongest acid that can exist in appreciable concentration in aqueous solution is
H₂SO4
HCI
H30
HNO3
H₂O
Organic Chemistry
Hydrocarbons(a) Mendeleyev discovered that when elements are arranged in order of increasing atomic weight, certain sets of properties recur periodically
(b) Main-group elements are those in the columns 3A to 8A of the Periodic Table.
(c) Nonmetals are found at the top of the Periodic Table, metalloids in the middle, and metals at the bottom.
(d) Among the 118 known elements, there are approximately equal numbers of metals and nonmetals.
(e) A horizontal row in the Periodic Table is called a group.
(f) The Group 1A elements are called the "alkali metals."
Organic Chemistry
HydrocarbonsWhen you blow bubbles in a glass of water, the following reactions take place: H₂O+CO2-->H₂CO3>H*+HCO 3
A. What type of reaction is H₂O+CO2 -->H₂CO3
B. What type of reaction is H₂CO3-H* +H CO3
Organic Chemistry
HydrocarbonsDraw the following and write the molecular formula:
3) 1-iodo-2-methylbenzene
4) cis-1,2-dichloroethene
5) cis-2-pentene
6)5-chloro-4-ethyl-2-heptyne
7) 3-methyl-1-butene
8) 4-chloro-1-cycloheptene
9) 4-bromo-2chlorophenol
10) 4-chloro-1-iodo-2-hexyne
Organic Chemistry
HydrocarbonsPropose an efficient synthesis for the following transformation:
A reaction shows Ethynylcyclopentane with SMILES string of C#CC1CCCC1 forming 1-Cyclopentylacetone with SMILES string of CC(=O)CC1CCCC1.
The transformation above can be performed with some reagent or combination of the reagents listed below. Give the necessary reagent(s) in the correct order, as a string of letters (without spaces or punctuation, such as "EBF"). If there is more than one correct solution, provide just one answer.
A. Mel
B. H₂, Lindlar's catalyst
C. NaNH2
D. 1) MeMgBr 2) H3O+
E. 1) O3, 2) H2O
F. 1) R₂BH 2) H₂O₂, NaOH
G. 1) EtMgBr 2) H3O+
H. H₂O, H₂SO4, HgSO4
I. Na₂Cr₂O7, H₂SO4, H₂O
Organic Chemistry
Hydrocarbonshow many degrees of unsaturation are present in each molecule below?
1. C₂H/Br3
2. C5H100
3. CsHsN
Organic Chemistry
HydrocarbonsA hydrocarbon having molecular weight 70 gives a single monochloride on chlorination. The number of dichlorides formed on (including stereoisomers) chlorination of the hydrocarbon will be ____
Organic Chemistry
HydrocarbonsDraw the structure of the organic product(s) of the reaction between (S)-3-methylhexan-2-one and phenylmagnesium bromide, followed
by acidification.
. Use the wedge/hash bond tools to indicate stereochemistry where it exists.
• Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner.
Separate multiple products using the + sign from the drop-down menu.
.
Organic Chemistry
HydrocarbonsThe synthesis above can be performed with some combination of the reagents listed
below. Give the necessary reagents in the correct order, as a string of letters (without
spaces or punctuation). Be sure to consider stereochemistry and regiochemistry.
A. HBr
B. Br2, CCl4
C. Br₂, light
D. NaCCH
E. HBr, ROOR
F. NaNH2
G. Na, NH3
H. CH3CH₂Br
Organic Chemistry
HydrocarbonsA student saw the following nuclear symbol for an unknown element:
2x
Which of the following statements about X and X-9 are true?
(Select all that apply.)
Ox2+ has 6 electrons.
OX is beryllium.
X has 9 neutrons in its nucleus.
X-9 has a neutron/proton ratio of about 1.3.
X is fluorine.
Organic Chemistry
HydrocarbonsWhat is the definition of an alkyne?
A. An alkyne is a hydrocarbon containing one or more triple bonds.
B. An alkyne is a hydrocarbon containing two carbon double bonds.
C. An alkyne is a hydrocarbon containing one or more multiple bonds.
D. An alkyne is a hydrocarbon containing one or more double bonds.
Organic Chemistry
HydrocarbonsBalance the following equation using whole numbers. What is the coefficient for CO₂?
C6H14+ O₂ -> CO₂ + H₂O
Select the correct answer below:
A. 2
B.1
C. 19
D. 12
Organic Chemistry
HydrocarbonsThe retrosynthetic arrow in the following scheme describes a reaction that would use which of the reagents below?
Organic Chemistry
HydrocarbonsDraw a structural formula for the acetal formed when two molecules of methanol combine with one butanal molecule.