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The following is a list of straight-chain alkanes, the total number of isomers of each (including branched chains), and their common names, sorted by number of carbon atoms.[1][2]

Number of C atoms Number of isomers[3][4] Number of isomers including stereoisomers[3][5] Molecular Formula Name of straight chain Synonyms
1 1 1 CH4 methane methyl hydride; natural gas
2 1 1 C2H6 ethane dimethyl; ethyl hydride; methyl methane
3 1 1 C3H8 propane dimethyl methane; propyl hydride
4 2 2 C4H10 n-butane butyl hydride; methylethyl methane
5 3 3 C5H12 n-pentane amyl hydride; Skellysolve A
6 5 5 C6H14 n-hexane dipropyl; Gettysolve-B; hexyl hydride; Skellysolve B
7 9 11 C7H16 n-heptane dipropyl methane; Gettysolve-C; heptyl hydride; Skellysolve C
8 18 24 C8H18 n-octane dibutyl; octyl hydride
9 35 55 C9H20 n-nonane nonyl hydride; Shellsol 140
10 75 136 C10H22 n-decane decyl hydride
11 159 345 C11H24 n-undecane hendecane
12 355 900 C12H26 n-dodecane adakane 12; bihexyl; dihexyl; duodecane
13 802 2412 C13H28 n-tridecane
14 1858 6563 C14H30 n-tetradecane
15 4347 18127 C15H32 n-pentadecane
16 10359 50699 C16H34 n-hexadecane cetane
17 24894 143255 C17H36 n-heptadecane
18 60523 408429 C18H38 n-octadecane
19 148284 1173770 C19H40 n-nonadecane
20 366319 3396844 C20H42 n-icosane didecyl icosane
21 910726 9892302 C21H44 n-heneicosane henicosane
22 2278658 28972080 C22H46 n-docosane
23 5731580 85289390 C23H48 n-tricosane
24 14490245 252260276 C24H50 n-tetracosane
25 36797588 749329719 C25H52 n-pentacosane
26 93839412 2234695030 C26H54 n-hexacosane cerane
27 240215803 6688893605 C27H56 n-heptacosane
28 617105614 20089296554 C28H58 n-octacosane
29 1590507121 60526543480 C29H60 n-nonacosane
30 4111846763 182896187256 C30H62 n-triacontane
31 10660307791 554188210352 C31H64 n-hentriacontane untriacontane
32 27711253769 1683557607211 C32H66 n-dotriacontane dicetyl
33 72214088660 5126819371356 C33H68 n-tritriacontane
34 188626236139 15647855317080 C34H70 n-tetratriacontane
35 493782952902 47862049187447 C35H72 n-pentatriacontane
36 1295297588128 146691564302648 C36H74 n-hexatriacontane
37 3404490780161 450451875783866 C37H76 n-heptatriacontane
38 8964747474595 1385724615285949 C38H78 n-octatriacontane
39 23647478933969 4270217915878409 C39H80 n-nonatriacontane
40 62481801147341 13180446189326135 C40H82 n-tetracontane
41 165351455535782 40745751356421890 C41H84 n-hentetracontane
42 438242894769226 126146261761339138 C42H86 n-dotetracontane
43 1163169707886427 391089580997271932 C43H88 n-tritetracontane
44 3091461011836856 1214115357550059889 C44H90 n-tetratetracontane
45 8227162372221203 3773978539594435261 C45H92 n-pentatetracontane
46 21921834086683418 1.17454674499017×1019 C46H94 n-hexatetracontane
47 58481806621987010 3.65973634249825×1019 C47H96 n-heptatetracontane
48 156192366474590639 1.14160680977903×1020 C48H98 n-octatetracontane
49 417612400765382272 3.56492605035317×1020 C49H100 n-nonatetracontane
50 1117743651746953270 1.11437894744930×1021 C50H102 n-pentacontane
51 2994664179967370611 3.48695195511947×1021 C51H104 n-henpentacontane
52 8031081780535296591 1.09212674104354×1022 C52H106 n-dopentacontane
53 2.15577719135726×1019 3.42372129990732×1022 C53H108 n-tripentacontane
54 5.79191808731484×1019 1.07425456458975×1023 C54H110 n-tetrapentacontane
55 1.55745431857550×1020 3.37353654348452×1023 C55H112 n-pentapentacontane
56 4.19149571193412×1020 1.06027803437626×1024 C56H114 n-hexapentacontane
57 1.12893957836133×1021 3.33501408819192×1024 C57H116 n-heptapentacontane
58 3.04304357190683×1021 1.04980159528436×1025 C58H118 n-octapentacontane
59 8.20861536686375×1021 3.30702230705762×1025 C59H120 n-nonapentacontane
60 2.21587345357704×1022 1.04250134336061×1026 C60H122 n-hexacontane
61 5.98580978477069×1022 3.28863382009164×1026 C61H124 n-henhexacontane
62 1.61805725349297×1023 1.03811173709570×1027 C62H126 n-dohexacontane
63 4.37671691526159×1023 3.27908841257682×1027 C63H128 n-trihexacontane
64 1.18461618538531×1024 1.03641522884615×1028 C64H130 n-tetrahexacontane
65 3.20828506618148×1024 3.27776398697850×1028 C65H132 n-pentahexacontane
66 8.69413071202487×1024 1.03723411195159×1029 C66H134 n-hexahexacontane
67 2.35737961344482×1025 3.28415364073692×1029 C67H136 n-heptahexacontane
68 6.39551595273481×1025 1.04042406553793×1030 C68H138 n-octahexacontane
69 1.73603007393950×1026 3.29784745978795×1030 C69H140 n-nonahexacontane
70 4.71484798515330×1026 1.04586901217870×1031 C70H142 n-heptacontane
71 1.28115131576464×1027 3.31851797512264×1031 C71H144 n-henheptacontane
72 3.48296574914069×1027 1.05347699979053×1032 C72H146 n-doheptacontane
73 9.47344738680449×1027 3.34590848928408×1032 C73H148 n-triheptacontane
74 2.57793062389544×1028 1.06317688936105×1033 C74H150 n-tetraheptacontane
75 7.01832115122141×1028 3.37982367012913×1033 C75H152 n-pentaheptacontane
76 1.91156381393249×1029 1.07491568187130×1034 C76H154 n-hexaheptacontane
77 5.20874195248907×1029 3.42012195021483×1034 C77H156 n-heptaheptacontane
78 1.41990891534395×1030 1.08865635628610×1035 C78H158 n-octaheptacontane
79 3.87228257513701×1030 3.46670937556328×1035 C79H160 n-nonaheptacontane
80 1.05644769069467×1031 1.10437611939016×1036 C80H162 n-octacontane
81 2.88336094362773×1031 3.51953462699296×1036 C81H164 n-henoctacontane
82 7.87255854643910×1031 1.12206499012211×1037 C82H166 n-dooctacontane
83 2.15027809474797×1032 3.57858499756067×1037 C83H168 n-trioctacontane
84 5.87531723826577×1032 1.14172465774427×1038 C84H170 n-tetraoctacontane
85 1.60591377849471×1033 3.64388315587311×1038 C85H172 n-pentaoctacontane
86 4.39100290809332×1033 1.16336756600997×1039 C86H174 n-hexaoctacontane
87 1.20102579077569×1034 3.71548456067735×1039 C87H176 n-heptaoctacontane
88 3.28612955581209×1034 1.18701618541837×1040 C88H178 n-octaoctacontane
89 8.99409590248916×1034 3.79347541983580×1040 C89H180 n-nonaoctacontane
90 2.46245150242821×1035 1.21270244338682×1041 C90H182 n-nonacontane
91 6.74391606297983×1035 3.87797110845861×1041 C91H184 n-hennonacontane
92 1.84751504801261×1036 1.24046728824609×1042 C92H186 n-dononacontane
93 5.06281811212116×1036 3.96911497803001×1042 C93H188 n-trinonacontane
94 1.38778575295845×1037 1.27036036776471×1043 C94H190 n-tetranonacontane
95 3.80518360708038×1037 4.06707750189460×1043 C95H192 n-pentanonacontane
96 1.04363664561059×1038 1.30243980672744×1044 C96H194 n-hexanonacontane
97 2.86312976836850×1038 4.17205571326637×1044 C97H196 n-heptanonacontane
98 7.85684759853088×1038 1.33677207115080×1045 C98H198 n-octanonacontane
99 2.15659631984508×1039 4.28427290059784×1045 C99H200 n-nonanonacontane
100 5.92107203812581×1039 1.37343190918329×1047 C100H202 n-hectane
101 1.62607500143337×1040 C101H204 n-henihectane
102 4.46670631687268×1040 C102H206 n-dohectane
103 1.22726610195426×1041 C103H208 n-trihectane
104 3.37281538963752×1041 C104H210 n-tetrahectane
105 9.27143441542280×1041 C105H212 n-pentahectane
106 2.54917652030591×1042 C106H214 n-hexahectane
107 7.01051065630088×1042 C107H216 n-heptahectane
108 1.92838773361102×1043 C108H218 n-octahectane
109 5.30557278101059×1043 C109H220 n-nonahectane
110 1.46002972524313×1044 C110H222 n-decahectane
111 4.01865724190509×1044 C111H224 n-undecahectane
112 1.10633962543222×1045 C112H226 n-dodecahectane
113 3.04636987596851×1045 C113H228 n-tridecahectane
114 8.38999942017075×1045 C114H230 n-tetradecahectane
115 2.31113265930118×1046 C115H232 n-pentadecahectane
116 6.36751554673601×1046 C116H234 n-hexadecahectane
117 1.75467195960063×1047 C117H236 n-heptadecahectane
118 4.83616671898832×1047 C118H238 n-octadecahectane
119 1.33316731232142×1048 C119H240 n-nonadecahectane
120 3.67574018395043×1048 C120H242 n-icosahectane

See also[edit]

References[edit]

  1. ^ "organic chemistry - How to determine number of structural isomers?". Stack Exchange. Retrieved 29 March 2019.
  2. ^ "Paraffins - Rosetta Code". rosettacode.org. 13 January 2019. Retrieved 29 March 2019.
  3. ^ a b Fujita, Shinsaku (2007). "Alkanes as Stereoisomers. Enumeration by the Combination of Two Dichotomies for Three-Dimensional Trees" (PDF). MATCH Commun. Math. Comput. Chem. 57 (2): 328 (PDF p. 30). ISSN 0340-6253. Retrieved 29 March 2019.
  4. ^ Sloane, N. J. A. (ed.). "Sequence A000602". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  5. ^ Sloane, N. J. A. (ed.). "Sequence A000628". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
source: https://en.wikipedia.org/wiki/List_of_straight-chain_alkanes

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