Which are isomers?

Ethanol and ethoxy ethane

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Methanol and methoxy methane

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Propionic acid and ethyl acetate

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Propanal and acetone

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Solution

The correct option is D Propanal and acetone
Isomers are the compounds having the same molecular formula but different structures.
a) Ethanol - $C_{2} H_{5} O H = 46$
Ethoxy ethane - $C_{2} H_{5} O C_{2} H_{5} = 74$
b) Methanol - $C H_{3} O H = 32$
Methoxy methane - $C H_{3} O C H_{3} = 46$
c) Propionic acid - $C H_{3} C H_{2} C O O H = 74$
Ethyl acetate - $C H_{3} - C O O C_{2} H_{5} = 88$
d) Propanal - $C H_{3} C H_{2} C H O = 58$
Acetone - $C H_{3} C O C H_{3} = 58$
Therefore, propanal and acetone are isomers.

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