Which sequence of reaction produce

1.	Which sequence of reaction produce
Answer» `CH_3-C -= C CH_3 underset("Lindlar's catalyst")overset(D_2)to` `CH_3C -= C CH_3 underset((2) CH_3COOD) overset((1) BD_3)to` `CH_3C -= C CH_3 underset((2) CH_3COOH)overset((1) BD_3,THF)to` `CH_3C -= CCH_3 underset((2)CH_3COOD)overset((1)BH_3, THF)to` Solution :Alkynes on deuteration / hydrogentaion in the presecne of Lindlar.s catalyst, `BD_3`, Nickelboride, UNDERGOES SYNADDITION and gives Cis Alkene.

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