Compound X is a hydrocarbon. Compound X will react with steam in the presence of a catalyst. The product of this reaction is ethanol. Compound X has the same number of carbon atoms as ethanol.

1. aName compound X and the homologous series to which it belongs. [2]
2. bComplete: the bromine water turns from … to … when shaken with compound X. [2]
3. cEthanol can also be prepared from glucose by fermentation. State two conditions necessary for fermentation to take place. [2]

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