The number of compounds in the following compounds belong to same homologous series is
`CH_(2)O_(2),C_(3)H_(8)O,C_(2)H_(4)O_(2),C_(2)H_(6),C_(3)H_(6)O_(2),C_(5)H_(10)O_(2),C_(3)H_(8)`

Explanation

To determine how many of the given compounds belong to the same homologous series, we first need to understand what a homologous series is. A homologous series is a group of organic compounds that have the same functional group and similar chemical properties, but differ by a constant unit, typically a -CH2- group.

Let's analyze the given compounds one by one:

1. **CH₂O₂**: This compound can be identified as an aldehyde or a carboxylic acid. It has 1 carbon atom.
2. **C₃H₈O**: This compound is an alcohol or ether. It has 3 carbon atoms.
3. **C₂H₄O₂**: This compound is acetic acid (a carboxylic acid). It has 2 carbon atoms.
4. **C₂H₆**: This compound is ethane, an alkane. It has 2 carbon atoms.
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