**Problem 5-21****Objective:** Identify which of the following compounds are chiral. Draw each compound in its most symmetric conformation, mark (*) any asymmetric carbon atoms, and draw any mirror planes. Label any meso compounds. You may use Fischer projections if you prefer.**Compounds to Analyze:**(a) meso-2,3-dibromo-2,3-dichlorobutane (b) (±)-2,3-dibromo-2,3-dichlorobutane (c) (2R,3S)-2-bromo-3-chlorobutane (d) (2R,3S)-2,3-dibromobutane (e) (R,R)-2,3-dibromobutane **References:**- Diagrams (f), (g), and (*h) are provided below descriptions. **Diagram Descriptions:**- Diagram (f): A Fischer projection of a sugar with an aldehyde group (CHO) at the top, two hydroxyl groups (OH) on the left and right on the second carbon, and a CH₂OH group at the bottom. This structure is a typical projection to illustrate stereochemistry in sugars. - Diagram (g): A chair conformation showing multiple carbon atoms with hydrogen and methyl (CH₃) groups attached. There are bromine (Br) atoms shown on some carbon positions. This representation helps visualize the spatial arrangement in cyclohexane derivatives. - Diagram (*h): Another chair conformation, similar to diagram (g), highlighting specific carbon atoms with bromine (Br) and methyl (CH₃) groups, indicating asymmetric centers with an asterisk (*). This emphasizes the analysis of chirality and mirror symmetry in the cyclic structure.

Before solving the questions, we need to know few important definitions which are as follows: Asymmetric carbon atom= four different substitutions on a carbon atom. Chiral molecule= atom consisting of asymmetric substitution (different) with its mirror image being non-superimposable. meso-compound= optically inactive compound characterised usually by a plane of symmetry.