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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[Given : $R_{\mathrm{H}}\left(\right.$ Rydberg constant) $=2.18 \times 10^{-18} \mathrm{~J}$.
$h($ Plank's constant $)=6.6 \times 10^{-34}$ J.s. $]$
If $Y$ gives precipitate with $AgNO_3 ,$ then $Z$ does not undergo reaction with
