1.1. This question is about alkenes.

Which of these has the molecular formula C₆H₁₀?

1.2. What is the systematic name of this alkene?

1.3. Two reactions of ethene are shown.

Complete the table.

Reaction	Reagent and condition	Product
1	HBr at room temperature
2

1.4. But-1-ene has the structure

i) Draw the structure of the polymer formed when but-1-ene polymerises. Include two repeat units.

(1)

ii) Calculate the number of molecules in 70.0 g of but-1-ene. [Avogadro constant = 6.02 × 10²³ mol⁻¹]

(2)