Difficult
Which of the following reactions gives $H_2C=C=C=CH_2$?
- A$CH_2Br-CBr=CH_2 \xrightarrow{Zn/CH_3OH}$
- B$HC \equiv C-CH_2-COOH \xrightarrow[40^{\circ}C]{Aq. K_2CO_3}$
- C$CH_2Br-C \equiv C-CH_2Br \xrightarrow[\Delta]{Zn}$
- D$2CH_2=CH-CH_2I \xrightarrow{}$
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