Draw the branched structural formula of the following organic compounds whose IUPAC names are given below.
1. Pent-l-ene
2. But-2-yne
3. 3-methyl pentane
4. 2-methyl-prop-l-ene
5. Pentane-3-ol
6. 1, 1, 2, 2 tetrabromoethane
7. 2-methyl butan -2-ol
8. 2, 2 dimethylpropan-l-ol
9. 2, 2 dimethyl propane