1.1. Compounds W, X and Y are all compounds containing carbon, hydrogen and oxygen only. Compounds X and Y are straight chain compounds, each containing five carbons. Compound W and a byproduct, compound Z, are formed from the reaction between compound X and Y. Compound X can be oxidised by the reaction with acidified potassium dichromate to give compound Y.

2.754 g of compound Y contains 0.027 moles.

Using the information given, state the name of compound Y.

1.2. Deduce the structural formula of compound W and explain how compound Z is formed in the reaction.

1.3. Compound X will oxidise to compound Y if allowed to fully oxidise. Explain how a student could stop the full oxidation of compound X. 

1.4. Deduce the formula of an isomer of compound X that will not react with acidified potassium dichromate, H⁺ / K₂Cr₂O₇.