Draw the structure of the compound:
4-bromo -l-ethylcyclopentene.

if you mean hydrogen and oxygen then water is the product

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a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.