Let’s go through each reaction step by step, identifying the products and, where necessary, their stereochemistry: --- ### (a) 1,3-Butadiene + HCl This is an **electrophilic addition** reaction. HCl adds to the conjugated diene, giving both 1,2- and 1,4-addition products. **Products:** - **1,2-addition:** Cl adds to C2, H adds to C1. - **1,4-addition:** Cl adds to C4, H adds to C1. **Structures:** - 1,2-addition:  - 1,4-addition:  --- ### (b) 1,3-Butadiene + H₂ (Pt) This is a **catalytic hydrogenation** reaction. The double bonds are reduced. **Product:** - n-butane (fully saturated hydrocarbon) --- ### (c) 1,3-Butadiene + Br₂ This is an **electrophilic addition** of Br₂. Both 1,2- and 1,4-addition products form. **Products:** - **1,2-addition:** Br adds to C2, Br to C3. - **1,4-addition:** Br adds to C2, Br to C4. **Structures:** - 1,2-addition:  - 1,4-addition:  --- ### (d) Cyclooctene + NBS (heat) NBS with heat causes **allylic bromination**. **Product:** - 3-bromocyclooctene (bromine attaches to the allylic position next to the double bond) --- ### (e) 1,3-Butadiene + Acrolein (with heat) This is a **Diels-Alder reaction**. **Product:** - 3-cyclohexene carbaldehyde (6-membered ring with one double bond and one -CHO group at position 3) --- ### (f) Furan + Dimethyl Acetylenedicarboxylate (heat) This is also a **Diels-Alder reaction** (furan as diene, DMAD as dienophile). **Product:** - The adduct is a bicyclic compound with two ester groups (cis orientation due to endo rule). --- **Let me know if you want the structures drawn for any of these!**