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Which one of the following hydrocarbon does not show positional isomerism and has three chain isomers ?

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a
C5H12
b
C4H6
c
C5H10
d
C4H10

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detailed solution

Correct option is A

Alkanes show only one type of structural isomerism which is chain isomerism ;Number of structural isomers (all chain isomers)  :C4H10 — 2  ; C5H12 — 3  ; C6H14 — 5  ; C7H16 — 9  ; C8H18 — 18  ; C9H20 — 35  ; C10H22 — 75  ;C5H12 ---- n-pentane , isopentane and neopentane ;

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