Consider the following structures I-IV.Which two species represent constitutional isomers? 
Definitions:
Immersion Oil
A type of oil used to increase the resolution of a microscope by minimizing refraction of light.
Aperture
An opening, hole, or gap, which in optics refers to the opening through which light enters a camera or microscope.
Oil Immersion
A technique used in microscopy to increase the resolving power through the use of oil with a high refractive index.
Objective
A goal or aim to be achieved.
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