Question

A pice of wood float in water what happen if water is replaced with alcohole

Answer 1

The piece of wood floats in water because the density of water is more than the density of the piece of wood.

So, the buoyant force exerted on the piece of wood is more than its weight

But if the piece of wood is kept in alcohol, it will sink sink because, the density of alcohol is less than the density of the piece of wood.

Hence, buoyant force exerted on the piece of wood is less than its weight.

Hope you understood.

Answer 2

$your \: answer$
alcohol <wood<water

the above relation tells about the density as wood is less dense than water it flaots but more denser than alcohol so sinks