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- Boiling point trends - use table on next page and the internet What is the approximate increase in b.p. with addition of one carbon to an alcohol? What is the boiling point (°C) of ethylene glycol? What is the effect of branching on b.p.? List the strongest attractive force between molecules for each compound. Rank boiling points from highest (1) to lowest (4). (Remember that attractive forces have a larger effect on bp than branching, consider them first.) Force Bp rank CH3 H3C OH CH3 CH3 HO Why is the boiling point so high? CH3 H₂C Solubility At what pH range will (CH3CH2)2CHCF₂COOH, pka = 2, be soluble in water? Toxicity Search pubchem. ncbi.nlm.nih.gov for one of the alcohols in Figure 1. Click on Toxicity in the righthand column and scroll the data. What is the human oral or inhalation toxicity listed. CH3 Alcohol you chose Toxicity Calculate the volume of 80-proof ethanol ( 40 %) , for example vodka, that would have a 50% chance of killing you, if you were a rat, using your body…1. About what volume does 0.15 mol of 2-methylcyclohexanol occupy at room temperature? 15.0 mL 18.5 mL 20.0 mL1. a. Sphingomyelin b. 7-Dehydrocholesterol c. Lithocholic acid For each molecule listed above i. Indicate whether the molecule (at physiological pH) would form bi-layers in an aqueous solution, form micelles in an aqueous solution or whether it would be (almost) completely insoluble ii. List all functional groups (e.g. alcohol, ketone, ester, quaternary amine) you can identify in the molecule
- Molecule Type Boiling point (°C) CH3CH2CH3 Alkane -42 CH3CHO Aldehyde +21 CH3CH2OH Alcohol +78 i. Why is the boiling point of the aldehyde greater than that of the alkane?ii. Why is the boiling point of alcohol the highest?iii. Explain why the solubility of aldehydes and alcohols falls as the molecules get bigger.9. Which of the following molecules is the least water soluble? НО. ОН Н НО `NH2 dopamine Н a. НО estradiol c. НО -NH НО ОН b. adrenalin Н HO d. cholesterol2. Which of the following reagents or tests would be useful in differentiating between propyl alcohol (CH3CH2CH2- OH) and isopropyl alcohol (CH,CHCH,)? enwon.in ОН Chromic acid b. Lucas reagent c. Aqueous bromine ho 8 aldaT More than one answer is correct. Explain your answer: 10 tire T 3. Which alcohol would be the least soluble in water? a. 1-Pentanol b. 1-Butanol c. 1-Heptanol bbs imo Explain your answer: bol Ho
- 3.4-Methylbutanal -3-methylbutanal 4.2,2-Dimethyl-3-butanone-3,3- dimethyl-2-butanone 5. 2-Pentanal- pentanal 3. In each pair of compounds, select the one with the higher boiling point. 1. Acetaldehyde or ethanol 2. acetone or 3-pentanone 3. butanal or butane 4. butanone or 2-butanol 5.2-Butanone or butanal. tomula for the princioal organic product formed whenWhy is methanol chosen as the solvent for recrystallization? A. Because it can easily be boiled off. B. Because the product and the impurities dissolve well at the boiling point of the solvent. C.Because the reactants dissolves less than the product in methanol at low temperatures. D.Because it has a low boiling pointa. What is the chemical structure of methyl orange dye? b. Is it polar or nonpolar? _______________________ c. What is its water solubility in g/L? __________________________
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