3- Draw the correct structures of the following: 1-1,2-Dimethylcyclohexene 2-4,4-Dimethylcycloheptene 3- Cis-2-Butene and Trans-2-Hexene cis-9-tricosene 5- Trans-9-tricosene
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- Following is a balanced equation for the allylic bromination of propene. CH2==CHCH3 + Br2 h CH2==CHCH2Br + HBr (a) Calculate the heat of reaction, H 0, for this conversion. (b) Propose a pair of chain propagation steps and show that they add up to the observed stoichiometry. (c) Calculate the H 0 for each chain propagation step and show that they add up to the observed H 0 for the overall reaction.Hydroboration of Alkenes vs. Alkynes. Addition of an alkylboranes to a carbon- carbon double bond ("hydroboration") followed by oxidation is a common way to alcohols, for example, addition of dimethylborane to 2,3-dimethyl-2-butene yields 2,3-dimethyl-2-butanol. Me₂BH + Me₂C=CMe₂- →→ Me₂CH-CMe₂OH The reaction is more general as borane also adds to carbon-carbon triple bonds. obtain structures and energies for reactants and transition states for addition of dimethylborane (Me₂BH) to both ethylene and acetylene. Which reaction has the lower activation energy? Offer an explanation for your result.In the light-catalyzed alkane chlorination mechanism, the first stage (first step) consists of the cleavage t DY -C-H »r ܘܘ: ܘܘ: ܀ X- + :Q -:+ *@ ܘ: ܘ: :ܘ: ܘ:
- Q3. For the following reactions, predict the products, mechanism and name all the products 4.2-hexene + chlorine gas5.Halogenation of cyclohexane in the presence of light and catalyst6.Sulfonation of Cyclobutane with oleum 7.Addition of HBr to methylcyclopropaneThe compound below is treated with chlorine in the presence of light. H₂C CH3 H₂C CH3 Draw the structure for the organic radical species produced by reaction of the compound with a chlorine atom. Assume reaction occurs at the weakest C-H bond. You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. Undo(dehydrobromination) A chemist carried out an elimination reaction of 1,1-dimethyl-2- bromocyclopentane. The chemist expected the reaction to yield alkene Z as product. However, alkene Z DID NOT form. Instead, three alkenes were produced: one alkene was the major product, the other two alkenes was the minor products. What was the major alkene product that formed? Br Select one: A. I B. II C. IV D. III alcohol HEAT || Z = + (HBr) IV
- Shown below is a carbocation intermediate in an electrophilic addition reaction of HCl with an alkene. For the conformation shown, select each hydrogen whose bond to carbon is aligned for effective hyperconjugation with the vacant p orbital on the positively charged carbon. Each adjacent carbon will have only one C-H bond so aligned. • Gray = C; white = H; red = 0; blue = N; dark green = Cl; brown =Br; light green =F; purple = I; yellow = S; orange = P. • Double click to select atoms. • You can zoom in and out using the mouse scroll wheel (or pinch to zoom on touch screens).An alkene having the molecular formula C7H₁4 is treated sequentially with ozone (03) and zinc/acetic acid to give the product/s shown. H3CO || CH3CHCH + H3C Draw a structural formula for the alkene. *8 CH3 • You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • In cases where there is more than one answer, just draw one. On [] ? Ⓡ ChemDoodleⓇORGANIC CHEMISTRY - PERICYCLIC REACTIONS Draw the mechanism, explain the stereochemistry of the products, indicate the type of reaction.
- Q2- Which one of the following reaction is unreasonabl? A) NaOH(aq)+HCl(aq)-NaCla+H₂O B) H2(g)+1/202)→ H₂Op AHneutralization=-851.5kJ/mol =-283.5kJ/mol AHormation C) CH3COOH + H₂O-CH:COO(g) + H AHassociation = +213.5kJ/mol D) Mg(+2HCl → MgCha) + H₂ - AHformation =+315.5kJ/mol Q3- If A 25.0 mL of diluted bleach solution has required 30 mL of 0.30 M Na S,O; to reach the endpoint of the titration. Calculate the mass percent of NaCIO in the original sample (Molar mass NaCIO = 74.5 g/mol). Assume the density of bleach solution is 1.084g/mL and the dilution factor is 10. B) 9.96% C) 0.996% D) 12.4% A) 19.92% and the coloCH3 CH3 Br- Br2 .CH3 CH2Cl2 CH3 H3C H3C Br Electrophilic addition of bromine, Brɔ, to alkenes yields a 1,2-dibromoalkane. The reaction proceeds through a cyclic intermediate known as a bromonium ion. The reaction occurs in an anhydrous solvent such as CH,Cl,. In the second step of the reaction, bromide is the nucleophile and attacks at one of the carbons of the bromonium ion to yield the product. Due to steric clashes, the bromide ion always attacks the carbon from the opposite face of the bromonium ion so that a product with anti stereochemistry is formed. Draw curved arrows to show the movement of electrons in this step of the mechanism. Arrow-pushing Instructions CH3 CH3 CH3 CH3 H3C H3C :Br: :Br:Similar to alkanes, hydrogen gas can undergo radical halogenation according to the following reaction, where X = F, CI, Br, or I. Propose a chain-reaction mechanism for this reaction, including an initiation step, propagation steps, and two plausible termination steps. H-H + X-X 2 H-X hv