Question

06 Question (4 points) e See page 574 Complete the mechanism. All necessary atoms and bonds (that is, those that are involved in the mechanism) are drawn in for you already; do not modify the structures by adding or removing any atoms. 1st attempt See Periodic Table See Hint Add the missing curved arrow notation.
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Answer 1

: 8-6 All necessary atoms, and bonds are drawn. We have to Just add the missing curred arrow notation in the structures (provided) Explanation... . It is Hydrobromination reaction of alkene. t electron attack the electrophilic Heatom in HBr Producing à 2 carbocation. Then 1,2 (Hz. shift occurs Producing more stable z carbocation intermidiate. At last Bro attacks the zo carbocation's ebetrophilie. Carbon atom resulting the concerned pdt. 8-9. Br Bri Br - Hydrobromination reaction of alky ne cu in presence of excess HBr produces (Product) geminal dibromo compound, . Cris

t excess HBr. Mechanism proposed ch Concerted step. ? Bir Hydrobromination .. of alkene Hiery M t ... (2 carboeation.) I nTop (3° carbocation) (Major)) : more stable. at first, alkyne reacts with Hbr in a concerted step. giving bromo allene. 3 ? (Major pat) This bromo alkene takes Вт part Hydrobromination reaction resulting the definite pat in major Erin amount. In the 3 carbocation, Etive charged carbon bearing Bratom. It seems to be unstable but electronegativity of Bratom is a here less operating, making a carbocation more stable lll. BriBr. 2 . 4

****sob 2° carbocation). Less stable) 3 shift. (3 carbocation) . OH more stable). : (2,3 dimethyl-2-butanol) Alkene takes up Ht producing a carbocation readily. If H₂O reacts with this 2 carbocation, then only We would get 3; 3-dimethyl-2-butanol- POH . (3,3-dimethyl . -2-butanol) But 2 carböcation is less stable compare to 3 carbo- cation.due to higher hyperconjugative effect of eth. groups as well as tI effect. so 2 carbo eation is readily converted into 3 carbocation through 1,2-eth shift. Then tho eft reacts with 3 carbocation resulting 2,3-dimethyl-2-butanol gö.. on 4 . X