Question

Shown below is the partial structural formula for the amino acid L-cysteine, HSCH2(NH2)CHCOOH. The dotted lines represent connectivity of the atoms, but the structure does not show the correct bond orders (single, double, etc.). Complete the following activity for L-cysteine. ННО 2 4 H N-H 1. Write the name and chemical formula of the molecule shown above. 2. Determine the total number of valence electrons in the molecule. 3. Use the partial structural formula to draw a Lewis structure for the molecule, accounting for all of the valence electrons. Be sure to draw the correct bond order (i.e. single, double, etc.) for each bond in the molecule. If multiple Lewis structures can be drawn, decide on the most probable correct structure and indicate the chosen structure. 4. Using your chosen Lewis structure and VSEPR theory, sketch the 3D projection formula of the molecule in your lab notebook, including labels for the specified central atoms (1,2,3,4) and bond angles (a,b,c,d). For each of the numbered central atoms in the molecule, list the following in a table: 5. i. Electron group geometry about the specified atom ii. Molecular geometry about the specified atom iii. Hybridization of the specified atom 6. 7. For each of the specified bond angles, use VSEPR theory to predict the angle. Finally, determine the total number of sigma (σ) and pi (T) bonds in the molecule.

Answer 1

Nome L-Cysteine auui nO-3- s Abouf no. 1 alom V-Shahe NiH boud augla About cfom no 2 Pnand dal cp H(NH) C0OH Atzout alom wo'2 HS-CH2 CH CooH Aboudt atomn 4 OH N H