In which of the following reactions $1,3$-butadiene will be obtained as a major product?
- A$Br-CH_2-CH_2-CH_2-CH_2-Br \xrightarrow[(CH_3)_3COH]{(CH_3)_3COK (2 \ mole)} CH_2=CH-CH=CH_2$
- B$HO-CH_2-CH_2-CH_2-CH_2-OH \xrightarrow{Conc. \ H_2SO_4} CH_2=CH-CH=CH_2$
- C$H_2C=CH-C\equiv CH \xrightarrow[Ni_2B]{H_2 (1 \ mole)} H_2C=CH-CH=CH_2$
- DAll of these
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