Propose a brief and efficient synthesis of trans-1,2-dimethylcyclohexane, starting with trans-2-butene as your only: source of carbon atoms.

Describe a sequence of reactions by which 2-hexyne can be prepared from acetylene while minimizing the number of steps required. O 1. NANH2; 2. CH3CH2CH2Br; 3. NaNH2; 4. CH3B1 O 1. NANH2: 2. CH3Br; 3. CH3CH2CH2B1; O 1. NANH2; CH3Br; 3. NANH2; 4. CH3CH2CH2B O A or B O A or C

Choose the right reagent or series of reagents from the ones listed to synthesize the following molecule (see picture) from benzene (C6H₁) or toluene (C6H5 CH₂). COOH NH₂ C6H₁ and HNO3, H₂SO4 followed by CH3 Cl, AlCl3 then KMnO4, A ○ C₁H₂CH3 and KMnO4, A, followed by HNO3, H₂SO4 ○ C6H₂ CH3 and HNO3, H₂SO4, followed by KMnO4, A, then Zn, HCI C6H₁ and CH3OH followed by KMnO4, A, then HNO3, H₂SO4 C6H₁ CH3 and HNO3, H₂SO4, followed by Zn, HC1

Help please

the complete hydrogenation of 2,4-octadiyne will result in what product?

11.; (a) Similar to alkanes, hydrogen gas can undergo radical bromination according to the reaction below. Propose a chain-reaction mechanism for this reaction, including an initiation step, propagation steps, and two plausible termination steps. The homolytic bond dissociation energy for Br-Br is 46 kcal·mole', for H-Br is 88 kcal'mole and for H-H is 104 kcal'mole'. hv H-H + Br-Br 2 H-Br (b) Calculate the overall AH for the above propagation steps (show all work).

(a) In an acid-catalyzed hydration, one of the following 10 carbon alkynes is expected to produce a single hydration product? Select the correct alkyne and draw the structure of the hydration product that is formed from this alkyne. (I) 2-decyne; (II) 3-decyne; (III) 4-decyne; (IV) 5-decyne; (V) none of these will give a single hydration product. (b) The reaction shown below gives Compound X as the major product. The mass spectrum of X is shown. Br2, H20 Compound X 100 - MS-IW-5644 80 60 40 - 20 - 20 40 60 80 100 120 140 160 180 200 220 m/z Considering the reactions of alkynes and the MS data, de duce which of following structures corresponds to X: Br Br HO, IV V I II II Support your answer with a reaction mechanism for fomation of X and identification of relevant peaks in the mass spectrum. 12 Relative Intensity

How is the mechanism for oxymercuration/demercuration reactions of alkenes understood?  How are the  (Markovnikov) products predicted and what reagents would you need to use to incorporate this reaction into a multistep synthesis strategy. Finally, what makes this a potentially more useful way to synthesize alcohols from alkenes than simple acid hydration?

Please draw the structures of (E)-1-chloropropene, 1,1-dichloro-2-methylpropene, and (E)-2,3-dichloro-2-butene and please rank them in terms of increasing dipole moment Arrange the following alkenes in order of increasing stability: 1-pentene; (E)-2-pentene; (Z)-2-pentene; 2-methyl-2-butene, thank you

Give a clear explanation handwritten in detailed of both subparts please