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

196. Subject : - Chemistry

A mechanism for the reaction of bromine with 4,4-dimethylcyclopentene in water is shown below. Which of the following statements about this mechanism is correct? Step 1 Br Br Br + Br Br Step 2 Br ;OH OH2 Br Br XX .. Step 3 + Hо HO:) H. O In Step 1, bromine could add to the other face of the alkene, giving a bromonium ion that is the enantiomer of the one shown. O In Step 2, water could attack the other carbon atom of the bromonium ion, leading to the enantiomer of the product shown. O This mechanism is complete and correct. O In Step 2, water could attack the bromonium ion from the other side, leading to the cis product.

4. The next reaction is the bromination of ethane. Links Br-Br Energy (kJ/mol) 192 CH3-CH3 + Br-Br hy heat CH3-CH2Br + H—Br H-Br 368 1. Calculate the AH° of each of the propagation steps. (4 points) CH3CH2-H CH3CH2-Br 410 285 2. Calculate the overall value of the AH° of this reaction. (2 points)

197. Subject : - Chemistry

Can you show the reaction mechanism step-by-step for  C₃H₈O (l)  → C3H6 (g) + H2O (l) propan-1-ol    →    propene + water Please show the electron movement and the way in which the bonds break. Can you please also show how many bonds there are and what type they are (eg. Sigma, Pi)? Thanks.

The 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

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Ⓡ

6. a) Write the reaction mechanism between 2-chloro-2-methylbutane with water CH,CH(CH,)CHCICH3 + H20 > CH3COH(CH3)CH2CH3 i) Name the type of reaction for this mechanism.