Among the following, the conformation that corresponds to the most stable conformation of meso-butane-2,3-diol is

Newman projections P, Q, R and S are shown below :



Which one of the following options represents identical molecules?

Which of the following structures has the IUPAC name

3-ethynyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid?

The Fischer projection of D-erythrose is shown below :



D-erythrose and its isomers are listed as P, Q, R, and S in Column - I. Choose the correct relationship of P, Q, R, and S with D-erythrose from Column - II.