Which of the following reactions gives H_2C = C = C = CH_2

1.	Which of the following reactions gives H_2C = C = C = CH_2
Answer» `CH_2Br- CHBr = CH_2 overset(Zn// CH_3OH)to` `HC -= C = CH_2 - COOH overset(aq. Na_2CO_3)to ` `BrCH_3 - C -= C -CH_2Br overset(Zn, "HEAT")to ` `2CH_2 = CH- CH_2I + Zn overset("heat")to` Solution :a) `CH_2Br - CHBr = CH_2 overset(Zn// CH_3OH)to CH_2 = CH=CH_2 + ZnBr_2` b) `HC -= C - CH_2 - COOH overset(aq. Na_2CO_3)to` `HC-=C-CH_2-COONa overset(DELTA)to HC -= C - CH_3` C) `BrCH_3 - C -= C-CH_2 Br overset("Zn, heat")to H_2C = C = CH_2+ ZnBr_2` D) `2CH_2 = CH - CH_2I + Zn overset("heat")to` `CH_2 = CH-CH_2 - CH_2 - CH = CH_2 + ZnI_2`

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