The equation 2c3h7oh + 9o2 yield 6 co2 + 8h2o is an example of what type of reaction

It's a complete combustion reaction
Complete combustion uses O2 and the product is CO2 where as incomplete combustion uses O2 but gives you Carbon and carbon monoxide

Alpha particles have positive charge, beta particles have negative charge, and answer 4 just doesn’t make sense. thus, you are left with only one possible answer.

If you open the bottle of perfume then nothing but the smell will come out of it and yes it is a type of gas smell because it’s say it in english so i can understand better and you