The reaction of $2,3$-dichlorobutane (as shown in the image) with $Zn$ dust and heat produces an alkene. Which of the following statements is correct about the product formed?

The major product of the following reaction is $:$

$CH_3-CH(CH_3)-CH=CH_2 \xrightarrow{DBr} \text{Product (Major)}$. The product will be:

In which of the following compounds will the carbon-carbon double bond length be maximum?

In the presence of peroxide,hydrogen chloride and hydrogen iodide do not give anti-Markovnikov's addition to alkenes because

Suppose the following reaction sequence: $CH \equiv CH$ $\xrightarrow[\text{excess}]{NaNH_2 / \text{liq. } NH_3} A$ $\xrightarrow{2 CH_3 - I} B$ $\xrightarrow{H_2 / Pd - BaSO_4, \text{ quinoline}} C$ and $C$ $\xrightarrow{H_2 / Pd - BaSO_4, \text{ quinoline}}$ $\xrightarrow{NaNH_2 / \text{liq. } NH_3} D$. How are $C$ and $D$ related?