Interpretation:
The major product for the given reaction sequence has to be predicted.
Concept Introduction:
Alkynes can be prepared from geminal dihalide or vicinal dihalide by treating with a very strong base.
Two equivalents of base is required because the substrate is a dihalide. If the alkyne formed is a terminal alkyne, then three equivalents of base has to be used resulting in salt formation of the alkyne. This on treatment with water gives the terminal alkyne. The general reaction can be given as shown below,

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