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Pre-laboratory assignment: Due Friday, March 27, 2020 1. Draw the reaction scheme for this reaction. 2. Complete the following table of reagents for the dehydration of 2-methylcyclohexanol: | Molecular weight (g/mol) Density (g/mL) Mass Moles Volume (ml) Reagent 2-methylcyclohexanol CHO Dehydration products (CH) Role in the reaction Limiting reagent Product 3. List the safety precautions that must be observed when using concentrated sulfuric and phosphoric acids. 4. What are the boiling points of 2-methylcyclohexanol and methylcyclohexene? 5. Why is the boiling point of the 2-methylcyclohexanol higher than the boiling point of the alkene product(s)? 6. What is the purpose of distillation? Give one example from real life where distillation is used. 7. What is the inorganic byproduct of dehydration? Why is it important to stop the distillation when the temperature reaches 100 °C? 8. Calcium chloride (CaCl) is a drying agent used to remove water from organic solutions. Explain the consequences of not drying the product with calcium chloride before proceeding to the IR data acquisition step.

Answer 1

SUUUZON a 24202015 uestion :- Dreaw the rreaction scheme fore this reaction. "Reaction scheme fore the acid catalysed 2-methylcyclohexanol is as follows- dehydration of CH3 OH H2304. CH3 I > TT + L CH3 0 + H20 Heat + rexene 2-methylcyclohexanel 1-methylcycloheron 3-methylcyclohexene There are two mechanisms. The Ei reaction mechanism on described for the foremation of the two main preoducts. 1 Ei reaction mechanism fore the formation of 1-methylcyclohexene is as follows in 93 CH3. 74 T +H₂O e 3 CH3 + H acid clb 27 reaction ++hot 1-methylcyclohexene mechanism fase the formation of 3-methylcyclohexene H CH3 CH3 T1T CH3 OH H at +420 VA CH3 + Hot 3-methylcyclohexene

table of reagents fore the s a 2 bome question - complete the following dehydration of 2-methylcyclohexanol: AN oleculare Reagent Density moles cal volume Role in the man of (ml) I reaction Limiting weight (glmet (g/m2) 12-methye cycloherance Ca Hiyo reagent preoduct. Dehydration preoducts (7 412) Ansi Reagent mreeculare weight Density/molls mass cg) volume Role in the (m2) reaction. (gimole) (g/m2) 2-methylcyclohexand 114.18 10.93 10.0407 4.655mL (say) limiting reagent. icular weight og) (volume =5m2 Density = mass .. mass =Volx Density volume meles - mass me molecular Reagent Density moles mass volume Role in weight of maw (gime) An reaction. 171-methylcyclohexene 96.17 10.811 preoduct 0.801 373-methyleyclohexene 96.17 Preoducts Theoretical yield of the abone two one leed of the two oreganie Theoretical Yield of the two oreganie brol products - the limiting reagent & molecular we moles of agend & molecular weight of s-methylcyclohen shexene) = 0.0407x96.17 the brooduct hebending on the stability of the Bercentage varries. = 3.914 a o breaducto,

onestion - prostion: L'inst the Lobserved when wine acids. int the safety preecautions that sing concentreated sulfuric must be and phosphoric Ansi 11 Always wear preotective googles, gloves and lab coat, as concentrated H₂SO4 causes serious damage to skin and clothing. 27 VIJIJOWY 27 when diluting H2SO4, add small volumes of the to lovege volumes of water to disperse heat whilst acid mixing throughly. My What are the boiling points of 2-methylcyclohexanol and methylcyclohexene? An - Boiling point of 2-methylcyclohexanol = 163-166°C Bolling point of 1-methylcyclohexene = 11000 Bolling point of 3-methylcyclonexene = 1040 57 Why's the boiling point of the 2-methylcyclohexanol higher than the bobling point of the aluene products? Ans; - The boiling point of 2-methyleyclohexanol is higher than the bouling point of the alkene preoducts because intermolecular hydrogen bonding is present inbetween two molecules of 2-methylcyclohexanol but no sich type of hydrogen bonding is present in the alkene products. The extrea. Stabilization gained by the intermolecular hydrogen bonding makes the boiling point of 2-methylcyclohexanada higher than the alkene products,

ho CHUB CHE ! TI - to A Formation of intermoleculast hydrogen bonding. - CH3 Questioni What is the pwepose of distillation? gire one exambel Froom real life where distillation is used. Ami Distillation is used to bweify a compound by sepereating it from a non-volatile are less - Volatile material! Because different compounds often have different boiling points, the components often seperate from a minture when the mixture as distillede Real life example of distillation - Distillation as wed to bweify water. Distillation is wed to purify water from Salt I guestion- what is the inorganic bypreoduct of dehydration wony Dit important to stop the distillation when the temperature reaches 100°C? Ant water is the inorganic byproduct of dehydration, It is important to stop the distillation when the temperature reches 100°C because above to is a chance to get a mixture of too and both the top alkene preoducts coats alkene product as boiling toint in on so they can easily evaporated with was ve lool produe The two 100°C alat alkene so they can

TIL 18 ging agent used to lar question't calcium chloride (Cacha) is a drying agent w remore water from organic solutions. Explain the Conseanences of not drying the product with Calcium chloride before proceeding to the It 2 acquisition step. 4200-3100 cm H₂0 gives cleare beak near Bogomol in IR speedreum. So after the reaction when IR data is taken fore the mixture it gives peak fore 140 Which confirmed that Hoo's the bypreaduct and it also confirms that the reaction is happening emple ating