Which of the following is the Fischer projection of $L-$ threonine (also known as $(2S, 3R) \, 2-$ amino $-3-$ hydroxybutanoic acid) ?
Correct configuration of the following is
In which structure central carbon ($C-3$) not chiral centre ?
How many stereoisomers possible for
Which of the following has both plane of symmetry and centre of symmetry
Optical activity of an enantiomeric mixture is $+12.6^{\circ}$ and the specific rotation of $(t)$ isomer is $+30^{\circ}$. The optical purity is $........\%$