MCQ
$I.U.P.A.C.$ name of above compound


- A$(2R, 3R)-3-$ Bromo $-2-$ butanol
- B$(2R, 3S)-3-$ Bromo $-2-$ hydroxy butane
- ✓$(2R, 3S)-3-$ Bromo $-2-$ butanol
- D$(2S, 3R)-2-$ Bromo $-3-$ butanol

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$PC{l_5}(g) \rightleftharpoons PC{l_3}(g) + C{l_2}(g)$ is