5) Which method would work best in carrying out the following conversion? a) HBr

Question

5) Which method would work best in carrying out the following conversion? a) HBr, then NaNH2 c) Br/H20, then NaNH2 b) Br2, then NaNH2 6) What is the major product of the reaction shown? 2 HCI a) 1,1-dichlorobutane b) 1,2-dichlorobutane c) 2,2-dichlorobutane d) 2,3-dichlorobutane 7) Which reagent below would be used to convert pent-2-yne into trans-pent-2-ene? 8) What is the relationship between the keto and enol forms of acetone (CH COCH:)? 9) How would you carry out the following conversion? a) NaNH: /NH b) H2 /Lindlar Pd c) Na/NH d) H O/HgSO4/HSO a) resonanc e structures b) diastereomers c) different conformations d) constitutional isomers CH, CH,CH C CH CHCH CH2CH,Br a) H2/ Lindlar Pd, then HBr c) HBr (1 equivalent), then H2/Pd b) H2/Lindlar Pd, then HBr (with peroxide) d) Br (1 equivalent) then H2/Pd

Explanation / Answer

5) option B is correct

Explanation: Addition of Br2 forms dibromo compound as product. NaNH2 gives dehydrohalogenation and prodcues alkyne as product.

6) option C is correct

Explanation: Addition of HCl to alkyne produces more substituted alkyl halide as product.

7) option C is correct

Explanation: Na, NH3 converts alkyne to trans-alkene.

8) option A is correct

9) optoin B is correct

Explanation: Reduction of alkyne with H2, Lindlard's catalyst produces alkene as product. Addition of HBr, peroxide to alkene produces the required alkyl halide as product.

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