Consider following structures. 
Only structure III represents a secondary alcohol.
Definitions:
Dichotomous
A characteristic of variables that can take on exactly two distinct and mutually exclusive values.
Level Of Measurement
The classification of data based on the nature and the mathematical properties of the data values, such as nominal, ordinal, interval, and ratio scales.
Nominal
Refers to categorical data that can be categorized but not ranked or ordered in a meaningful way.
Level Of Measurement
The scale or type of data that determines the kind of statistical analysis that can be used.
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