MCQ
Name the hydrocarbon that is a liquid at $STP$
- AEthane
- BPropane
- C$n-$ butane
- ✓$n-$ pentane
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[Atomic mass: $\mathrm{Ag}=108, \mathrm{Br}=80$ ]


$(I) \,C{H_3}CH = C{H_2} + HBr\xrightarrow{{peroxide}}$
$(II)\, C{H_3}CH = C{H_2} + HBr\xrightarrow{{CC{l_4}}}$
$(III)\, C{H_3}C{H_2}C{H_3} + B{r_2}\xrightarrow{{hv}}$
$(IV)\,C{H_3}CH = C{H_2} + B{r_2}\xrightarrow{{CC{l_4}}}$