please answer 4-6

4. Draw as a polygon structure one of the following steroids Estradiol Estr-1.3.5(10)-triene-3,173-diol or Testosterone 173-hydroxyandrost-4-ene-3-one entz CHC 5. Fill in non-bonding electrons and draw the resonance forms using arrows on one structure to show the movement of electrons in the following ions or molecules. [b] // Atz-C N- oo 6. Acid base reactions reach equilibrium almost instantly on mixing Draw the conjugate acid and conjugate base for the following a proton transfer reactions, and using the pKa values you are given, circle the arrow in the direction that the equilibrium lies. } + cazoo [a] CigaOH pka=4.7 [b] CabatNH3 + atzag pka = 10.7 7. Circle the one more stable structure in each of the following pairs of molecules or ions CHg CH3 delet NA TA (CH3 CHICHS Tats), EcHlutzz H H atz 8. Inspect the following molecules and label each as Zor E isomers if appropriate. atz Br -413 CH3 Br 3 3 4 9. Write a reaction mechanism for the addition of hydrogen bromide to 3-methyl-1-butene. Show the carbocation formation and rearrangement leading to the major 3 alkyl bromide product