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 9) cis 1,2 dimethyl cyclohexane

a)

HC CH, most stable conformation ( every other structure is similar because always one methyl will be in equatorial position and other in axial position)

b)

CH3 CH3 CH3 Br -CH3 Brz. hv

c)

CH3 CH3 CH3 CHF CH3 CH3 CH3 F2 -CH₃ + + hv F

d) Bromination is less exothermic than fluorination. Bromine is less reactive than fluorine and are muchore selective thus only one product is formed. But fluorine is vigourously reactive and forms many produts.

e) The reaction betweem 1 bromo 1, 2 dimethylcyclohexane and hot ethanol follows fist order nucleophilic substitution reaction (S N 1) ans well as unimolecular elimination reaction (E1).

f)

CH3 CH2 CH3 hot CH,OH CH3 -OCH 3+ +

mechanism

S N 1

CH3 CH3 CH3 CH3 CH3 CH3 -Br CH3 OCH 3 CH3 CH,OH -OH CH3

E1

CH3 CH3 CH3 CH3 -Br CH2 CH,OH

CH3 CH3 CH3 Нас не „Сн, CH3 -Br 8 CH,OH

The major product is CH3 CH3 according to saytzeff's rule ( According to Saytzeff Rule the elimination will lead predominantly to the olefin in which the double bond is more highly substituted)

g)

CH3 CH3 CH3 R? R Br CH3 CH3 .....OCH 3 CH₃ R hot CH,OH R G S Biz hv

The product is (1R,2R)-1-methoxy-1,2-dimethylcyclohexane

CH3 (4 сна ...OCH3 3 anticlockwise and least priority towards you - R configuration

Hс н CH3 ...ОСН3 clockwise and least priority away from you - R configuration

h)

CH3 CH3 cis 1,2-dimethylcyclohex-1-ene ( the two similar groups are on same side)

CH3 CH2 1-methyl-2-methylidenecyclohexane ( neither cis nor trans)

CH3 CH3 1,6-dimethylcyclohex-1-ene( neither cis nor trans)

i)

CH3 CH3 CH3 CH3 Br NaOCH

ST

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QUESTION 6 (a) The bar shown in Figure Q2(a) is subjected to tensile load of 150 Kn. If the stress in the middle portions is limited to 160 N/mm², determine the diameter of the middle portion. Find also the length of the middle portion if the total elongation of the bar is to be 0.25 mm. E E = 2.0 + 105N/mm². (12 marks) 150 KN 10 cm DIA 10 cm DIA 150 KN 45 cm Figure Q6(a) (b) A brass bar, having cross-section area of 900 mm², is subjected to axial forces as shown in Figure Q2(b), in which AB = 0.6 m, BC = 0.8 m, and CD = 1.0 m. Find the total elongation of the bar. E = 1.0 + 105N/mm2 . (8 marks) Page 4 of 5 B D 40 KN 70 KN 20 KN 10 KN Figure Q6(b) (TOTAL = 20 MARKS)

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SERVER DISCORD FREE CHEGG, COURSEHERO, BARTLEBY https://discord.gg/eGMtZaqSZP https://www.coursehero.com/tutors-problems/Environmental-Science/29241920-Compare-and-contrast-chemical-oxidation-and-chemical-reduction-technol/?justUnlocked=1 ad Oxidation-reduction reaction , also called redox reaction , any chemical reaction in which the oxidation number of a participating chemical species changes. The term covers a large and diverse body of processes. Many oxidation-reduction reactions are as common and familiar as fire, the rusting and dissolution of metals, the browning of fruit, and respiration and photosynthesis—basic life functions.  Oxidation is the  gain  of oxygen. Reduction is the  loss  of oxygen. Most oxidation-reduction (redox) processes involve the transfer of oxygen atoms, hydrogen atoms, or electrons, with all three processes sharing two important characteristics: (1) they are coupled in any oxidation reaction a reciprocal reduction occu...

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