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R−CH2−C≡C−R Reagent → R−C≡C−R The reagent is

1. Na
2. HCl in H2O
3. KOH in C2H5OH
4. Zn in alcohol

Correct answer: Na

Solution

The reaction involves the dehydrohalogenation of a vicinal dihalide to form an alkyne. Sodium (Na) is used as a reagent to remove hydrogen atoms, facilitating the formation of the triple bond.

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