Question 46
HydrocarbonsHow many grammes of bromine will saturate 5.2 g of but-1-ene-3-yne? [C = 12, H = 1, Br = 80].
- A.64.0 g
- B.48.0 g
- C.32.0 g
- D.16.0 g
Show the answer and explanation
Answer: B (48.0 g)
Explanation
But-1-ene-3-yne is CH2=CH–C≡CH, C4H4 (52 g mol−1), so 5.2 g = 0.1 mol. The double bond takes 1 Br2 and the triple bond 2, so 0.3 mol Br2 = 0.3 × 160 = 48 g.