How important is the presence of air bladder in Pisces?

Due to the absence of air bladder, fishes belonging to the class Chondrichthyes have to swim constantly. How important is the presence of air bladder in these fishes?

How is the presence of SO_2 detected?

Look at the following reactions on heating pentane: 1)In the presence of air, 2) In the absence of air. Write the chemical equation for the reactions.

on heating pentane: Write the name of the reaction 1)In the presence of air, 2) In the absence of air

How will you detect the presence of unsaturation in an organic compound?