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Question
C5H12 has a symmetrical structure with one quaternary carbon. Its IUPAC name is:
Options:
A .  2-Methylbutane
B .  n-Pentane
C .  2,2-Dimethylpropane
D .  1-Methylbutane
Answer: Option C
:
C
C5H12 is of the form CnH2n+2.
Hence it is a saturated alkane. Further, it is given that it has a quaternary carbon. Hence its structure is:
C5H12 Has A Symmetrical Structure With One Quaternary Carbon...
Longest chain = 3 carbons word root = prop
Primary suffix = ane
Secondary prefix = 2,2-Dimethyl
IUPAC name is (c) 2,2-Dimethyl propane

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