Is the conversion of 1-butene to 1,2-dibromobutane an oxidation, reduction or neither?

An alkene forms 2-methylpropane when catalytically reduced and 1,2-dichloro-2-methylpropane when treated with Cl₂. Draw the structural formula of the alkene. • You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • In cases where there is more than one answer, just draw one. / √ [F ? ChemDoodle

Draw the structure of trans-1-cis-Butyl-4-methylcyclohexane. Show lone pairs and charges.

1,4-Pentadiene (CH2=CH-CH2-CH=CH2) is a liquid at room temperature and has a density of 0.66 g/mL and molar mass of 68.12 g/mol. In a laboratory experiment, 3.80 mL of this compound was treated with 4.80 mL of conc. H2SO4 (100% w/w; molar mass 98.08 g/mol). Note that the density of conc. H2SO4 is 1.84 g/mL. The resulting sulfate ester was then treated with 1.20 mL of water (molar mass 18.02 g/mol) affording, after work- up, 2,4-pentanediol (molar mass 104.15 g/mol) as the crude product. The crude product was then purified by simple distillation, which yielded 2.00 g of pure product.   a.  Provide a balanced chemical equation to show the reaction between 1,4-pentadiene and sulfuric acid. Do not use molecular formulas in the chemical equation except for sulfuric acid.   b.  What reactant is the limiting reagent in this chemical equation? Show calculations to support your answer.