32. Which of the following forms when 1,3-cyclohexadiene is treated with one equ

Question

32. Which of the following forms when 1,3-cyclohexadiene is treated with one equivalent of Br? 1,2-dibromocyclohexene 3,4-dibromocyclohexene 1,3-dibromocyclohexene D 3,6-dibromocyclohexene E Both B and D. Which of the following can be used to accelerate a Diels-Alder reaction? A add electron-withdrawing substituents to both the diene and dienophile. B add electron-donating substituents to both the diene and dienophile C add an electron-donating substituent to the diene and an electron-withdrawing one to the dienophile. D Both A and B. 33. E None of the above 34· The mechanism ofthe Diels-Alder reaction involves: a zwitterionic intermediate. a biradical intermediate. C a carbocation intermediate. D an anionic intermediate. E no intermediate. 35. Which of the following is not a pericyclic reaction? A B C D E Cope rearrangement Diels-Alder reaction addition of H: (hydrogen) to an alkene Claisen rearrangement addition of Os (ozone) to an alkene

Explanation / Answer

Ans 32 : 3,4-dibromocyclohexene

1,3-cyclohexadiene has double bonds at two positions , 1 and 3. So when the compound is reacted with one equivalent of Br2 , one double bonds breaks , and two bromine atoms attach on these two carbon atoms. The resultant structure has two bromine atoms along with one already existing double bond. So the name of the product becomes : 3,4-dibromocyclohexene.

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