Which of the following molecular formula corresponds to ethyl butanoate ester?

63 Which of the following can damage optic nerve leading to blindness, if taken internally? 64 The usual disease caused by the excessive drinking of alcohol over a long period of time is: 66 A neutral organic compound X of molecular formula C₂H₆O on oxidation with acidified potassium dichromate gives an acidic compound Y. Compound X reacts with Y on warming in the presence of cone. H₂SO₄ to give a sweet smelling substance Z. What are X, Y and Z? 67 Consider the following organic compounds:

HCHO, C₂H₅OH, C₂H₆, CH₃COOH, C₂H₅Cl

Choose two compounds which can react in the presence of cone. H₂SO₄ to form an ester. Give the name and formula of the ester formed.