MCQ
The reaction, is fastest when $X$ is


- ✓$Cl$
- B$N{H_2}$
- C$O{C_2}{H_5}$
- D$OCOR$

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What will be $B$ ?
$CH_3-CH_2-C \equiv CH + HCl \to B \xrightarrow{{HCl}} C$