MCQ
Which has maximum vapour pressure
- A$HI$
- B$HBr$
- ✓$HCl$
- D$HF$
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The reaction will be most favourable if $M$ happens to be

$C{H_3}C{H_2}CH = CHC{H_3}$ $\xrightarrow{X}C{H_3}C{H_2}COOH\, + \,C{H_3}COOH$
The $X$ is