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Magazine Chapter 20: Q19P (page 1038)
Classify each hydrogen atom in the following compounds as primary (10),secondary(20) , or tertiary(30).
(a) butane
(b) isobutane
(c) 2-methylbutane
(d) cyclohexane
(e) norbornane (bicyclo heptane)
Short Answer
(a)
(b)
(c)
(d)
(e)
Step by step solution
Primary hydrogen (10)
A primary hydrogen may be defined as a hydrogen on a carbon attached to only one other carbon atom.
Secondary hydrogen (20)
A secondary hydrogen may be defined as a hydrogen on a carbon attached to only two other carbon atoms.
Tertiary hydrogen (30)
A tertiary hydrogen may be defined as a hydrogen on a carbon attached to three other carbon atoms.
Classifying each hydrogen atom as primary(10) , secondary(20) , or tertiary (30)
(a)
In butane, there are both primary and secondary hydrogens.
(b)
In isobutane, there are primary, secondary and tertiary hydrogens.
(c)
In , there are primary, secondary and tertiary hydrogens.
(d)
In cyclohexane, all the hydrogens present are secondary since the hydrogens on carbon are attached to only two other carbon atoms.
(e)
In norbornane (bicyclo heptane), there are secondary and tertiary hydrogens.
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