With each of the substances: С3Н7ОН, Br2, KOH – the following can react: 1) ethane 2) acetic acid 3) ethyl alcohol 4) acetaldehyde.

1) C3H7OH- alcohol, from the listed substances can react with acetic acid. This is such a classic esterification reaction (reaction products are ester and H2O)
2) Br2 also reacts with acetic acid
3) Interaction of KOH and acetic to-you typical reaction of neutralization (interaction of acid and alkali)
Next, the answer is option 2



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