Question

I need help with number three, four, and five.

9:30 T-R pror. Sudd Ivan Martinez which of the following molecules would be the easiest to hydrogenate? What is the major product from the following reaction? G. none of the above + 2HCl D . What is the major product from the following reaction? a G. none of the above 4. What is the best choice of reagent to perform the following reaction? A. H, and Pt B. H, and HCI C. Na and NH, HC-CECCH D. BH, and 2)+ H,O/NaOH нсн 5. What is the best choice of reagent to perform the following reaction? A. H, and Pt B. H, and HCl HC--EC-CH; Cec C. Na and NH, ? H₃ CH₃ D. BH, and 2)+ H20./NaOH 6. Briefly explain the major drawback to the reactions in questions 4 and 5. Reference: 9.5 - 9.10 (411 - 425)

Answer 1

Ans - since, we know know that Hydrogentation of alkynes are reduction ucaction. so. The addition cy the 4₂ on allane is Electrophilic Addition neaction so the rate of this reaction depends upon the more reactiuue substrate . so, among the following given alkynes, h = o = The © = has righell seachauty because the substituents which are & I group, increase the anali- -ability affum for more requirement of Electrophile on the group which can, it ques his election and make it self more stable. Ans - tud This is electrophillic addition reaction so we will get attached and a formation al nome Stable cambocation takes place. t ce au

Now, and to attacks on the cau bocahren forned a alkenyl chloride would soumed. Hence, the connecten apten a ® ...

An-3 The correct option for this reaction is option @.. In this reaction gen dichloride get sommod. the mechanism of reaction is geven below 8 - step- 0 Electrophillfe addition of first hal on allegue and formation an al kene baloes place , NOWO, these carbocation react with a to con. or y una step- Now, formed alkene with another meele as nu and a gem dikhloride Joumed. of u cha

with laubochon founned Niew, the ele rien neach " AC u su vyle mtu OM ? Ya caption ② is connect answer chy Ans -(0 1 : HBC - CE C-CH3 - - Ĉ =( The best reagent which is aptien & quen belowo this conuension © the mechanism H2C is Na and XI H₂ for aboux conuersion No0 CO CH3 c = ① RE- & = c - Rla na + 30--- bawansol hold M-Nr2 04 Uz c

n euz y Mac O la or Nas se Ugc 4-NH2 Caelle OM cu doc Anos Uz C-cec-CH₂ - 2 C cig For this conuension , the best reagent is H₂ ano.pt. the mechanism is that the ly duogen get absoubed an the surface of Pt and then the alkyne molecules apport -ached on this surface and condition which is syn addition of Hq takes place.

es An-6 the major drawback as the reactions in - questions 4 and #s is that they are stero- -specific reactions. The reaction of alkyne with Na and Nils leads to formation of trans-alkene and the reaction of allyne with H₂ and it leads to Joumation as chis-alkene.
i try to explain everything as i much i know so if you get the answer please likes the answer.