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In the IUPAC nomenclature (naming system), they fall back on Latin numeration.
'Pent' in the name means five(5) , so there ate five atoms of carbon .
Correspondingly , the '-yne' means there is a TRIPLE bonded pair of carbons.
The '1' indicates the position of the carbon at the start of the triple bond.
So 1-pentyne is structured. ' H-C(1)///C(2) - C(3)H2-C(4)H2-C(5)H3
The figure in brackets represents the carbon number in the chain .
NB
Pent = 5
Hex = 6
Hept = 7
Oct = 8
Non = 9
Dec = 10
NNB
ALKANE ; Single bond between two caebons ; C-C
ALKENE ; Double bond between two carbon ; C=C
ALKYNE ; Triple bond between two carbons ; C///C
Note there is only one letter difference between the classifications.
lenpollock
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