How many chiral carbons are there in Reserpine (an antipsychotic drug)?

Which is the correct structure of $D$-glyceraldehyde?

What is the absolute configuration of the following molecules? ($NS =$ the molecule has no stereocenter) Note: For the purpose of this question only,the order of stereocenters is not specified; i.e.,$R, S = S, R$.
$(I)$ || $(II)$ || $(III)$ || $(IV)$

Which of the following compounds will rotate the plane polarized light at room temperature?

Which of the following molecules has a plane of symmetry?

Determine the correct priority order for the following compound to assign the $R$ or $S$ configuration.
$\begin{array}{c} CHO \\ | \\ H-C-OH \\ | \\ CH_2OH \end{array}$