Among the following compounds which are isomers? I. CH3CH2–0-CH3 II. CH3CH2CH2-OH
II. CH3CH2–0-CH2CH3 IV. CH2=CH-O-CH3
A. I and II
B. I and III
C. II and III
D. I and IV

Achemical reaction is done in the setup shown , resulting in a change of mass. what will happen if the same reaction is done in a sealed container that is placed on the electronic balance?