Concept explainers
(a)
Interpretation: The curved arrows are to be used to show the conversion of A and B to C.
Concept introduction: The Diels-Alder reactions are the
Curved arrows aid in determining the movement and flow of electrons in the reaction. The electrons that take part in the chemical reactions are shown by the curved arrows. An electronegative element in the reaction attracts electron toward it.
Half headed arrows are used to show the flow of single electrons, while the full headed arrow shows the movement of electron pairs.
(b)
Interpretation: The bonds that are broken and formed in the given reaction are to be identified.
Concept introduction: The bonds in the reactions are broken to form the new compounds. During the formation of products, new bonds are formed. The sum of bonds broken and bonds formed in the reactions are used to calculate the enthalpy change in the reaction.
(c)
Interpretation: The reaction is endothermic or exothermic is to be identified.
Concept introduction: The chemical reaction in which energy is released during the formation of products is known as exothermic reactions. The energy released during the reaction is denoted by
(d)
Interpretation: Entropy favors the reactants or products are to be identified.
Concept introduction: The change in Gibbs free energy, enthalpy and entropy is represented by
The change in Gibbs free energy describes the spontaneity of the reaction. The change in enthalpy describes the relative bond strength in the substance, whereas the change in entropy describes the randomness in the system.
(e)
Interpretation: The Diels-Alder reaction is to be classified as a substitution, elimination, or addition reaction.
Concept introduction: The substitution reactions involve the substitution or replacement of an atom or group of atoms in a compound by anotheratom or groups of atoms. In the substitution reactions, the replacement takes place by the break down of sigma bonds.
In elimination reaction, the formation of
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LL ORG CHEM
- a. 5. Draw the product(s) of each addition reaction b. d. دھ HBr H2SO4, H₂O Bra, H2O a. 9-BBN b. H2O2, NaOHarrow_forwardBr2 ? How many moles of Br are required to completely halogenate the alkene? A. Three moles B. Four moles C. Two moles D. One mole What is the expected arrangement of the bromine atoms relative to each other among the carbon involved in pi bonding? A. trans-configuration B. anti-conformation C. cis-configuration D. syn-conformation What happens to bromine when it is adjacent to an alkene during a chemical reaction? A. Bromine becomes polarized. B. Bromine becomes acidic. C. Bromine becomes hybridized. D. Bromine becomes stable. The relative arrangement of bromine atoms in the product is primarily due to: A. Hydrogen bonding B. Electronegativity C. Atomic weight D. Repulsion What is your observation after the reaction? A. Bromine water decolorizes. B. A brown precipitate forms. C. The alkene becomes denser. D. A yellow flame is produced.arrow_forwardDraw the structure of a dihalide that could be used to prepare each alkyne. There may be more than one possible dihalide. CH3 b. CH₂-C-C=CH CH₂ a. CH₂C=CCH₂ C. -C=C-arrow_forward
- Determine which reactions would occur (substitution, elimination, both, or neither). CH;CH,OH a. SN1 O b. E1 C. SN1 & E1 O d. SN2 е. Е2 O f. SN2 & E2 g. No reactionarrow_forwardHomolysis of the indicated C–H bond in propene forms a resonancestabilized radical. a.Draw the two possible resonance structures for this radical. b.Use half-headed curved arrows to illustrate how one resonance structure can be converted to the other. c. Draw a structure for the resonance hybrid.arrow_forwardDraw the structures of the products obtained from the reaction of each enantiomer of cis-1-chloro-2-isopropylcyclopentane with sodium methoxide in methanol. b. Are all the products optically active? c. How would the products differ if the starting material were the trans isomer? Are these products optically active? d. Will the cis enantiomers or the trans enantiomers form substitution products more rapidly? e. Will the cis enantiomers or the trans enantiomers form elimination products more rapidly?arrow_forward
- Draw the products (including stereochemistry) for each reaction. a. H20 b. :C=C-H H Br H Darrow_forward6. Consider the structure of cis-1,2-dimethylcyclopropane and trans-1,2-dimethylcyclopropane A. Which compound is more stable? Explain. B. Which compound will release more heat upon combustion? Explain C. Based on the following interactions, predict the difference in energy between the cis and trans isomers. Each CH3 Each CH3 Each H Each H CH3 gauche interaction is worth 0.9 kcal/mol CH3 eclipsed interaction is worth 2.6 kcal/mol CH3 eclipsed interaction is worth 1.4 kcal/mol H eclipsed interaction is worth 1.0 kcal/molarrow_forwardWhen 2-bromo-2,3-dimethylbutane reacts with a strong base, two alkenes (2,3-dimethyl-1-butene and 2,3-dimethyl-2-butene) are formed. a. Which of the bases (A, B, C, or D) would form the highest percentage of the 1-alkene? b. Which would give the highest percentage of the 2-alkene?arrow_forward