Select the best reagent or sequence of reagent from list provided which would be

Question

Select the best reagent or sequence of reagent from list provided which would best accomplish each transformation below place the corresponding to the reagent(s) in the blank to the left of each reaction each requires only one answer. H_2SO_4, H_2O, H_gSO_4 H_2 landler 1 BH_3 THF 2 H_2O_2 1 NaNH_2 NH_3 2 CH_3 CH_2I Br_2, CCi_4 NaNH_2 NH_3 HCi NaNH_2 NH_3 Li/NH_3 NaNH_2 NH_3 CH_3 CH_2CH_2I mark f here and c on scan sheet mark g here and d on scan sheet mark h here and e on scan sheet Refer to Matching

Explanation / Answer

11. Answer is Li/NH3 .

the NH3 should be NH3(liq). The metal Li is dissloved in the liquid ammonia.

Option: g

12. conversion of terminal alkyne to corresponding ketone without increment of carbon atom is provided by H2SO4,H2O,HgSO4 (if you want to convert terminal alkyne to aldehyde the proper regeant is BH3, H2O2,THF)

Option: a

13. Acetylene on reaction with NaNH2 will form the sodium acetylide and then reaction with RX (R = any alkyl group and X = any halide I or Br). So, here CH3CH3CH2I to yield corresponding 1-pentyne.

Option: h

14. Option : e

the first step is halogenation of alkyne and then dehalogenations are triggered by addition of strong base

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