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Here are the answers to your questions: 28. (d) (i) Substance T is Ethanol. (ii) The property of ethene that allows it to be collected as shown in the setup is that it is insoluble or sparingly soluble in water. 28. (e) The name of the polymer formed is Poly(ethene) or Polyethylene*. One disadvantage of this polymer is that it is non-biodegradable*, leading to environmental pollution. 29. Step 1: Determine the molecular formula of the hydrocarbon. Given the molecular mass is 58. The atomic mass of C is 12 and H is 1. For a hydrocarbon C_xH_y, the molecular mass is 12x + y. 12x + y = 58 By trial and error, if we assume x=4: 12(4) + y = 58 48 + y = 58 y = 58 - 48 y = 10 So, the molecular formula is C_4H_10. Step 2: Draw two possible structures and name them. The molecular formula C_4H_10 corresponds to an alkane. 1. Butane (or n-butane) CH_3-CH_2-CH_2-CH_3 2. 2-Methylpropane (or isobutane) CH_3-CH(CH_3)-CH_3 30. (a) Step 1: Write the reaction of ethyne with hydrogen bromide. Ethyne (CH) undergoes an addition reaction with hydrogen bromide (HBr). CH + HBr → CH_2=CHBr Step 2: State the structure and name of the product. The structure of the compound formed is: CH_2=CHBr The name of the compound is Bromoethene (or Vinyl bromide). 30. (b) Step 1: Identify the molecular formula. The molecular formula of the alkyne is C_4H_6. Step 2: Draw two possible structures for alkynes with this formula. 1. But-1-yne CH-CH_2-CH_3 2. But-2-yne CH_3-C-CH_3 That's 2 down. 3 left today — send the next one.