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name of the compound formed is unambiguous; - before the suffix
is a-acid or -al, since these groups are always at the beginning of
the chain. If the molecule has double and triple bonds, the choice
of the numbering direction is carried out by double bonding.
Then locate a double link before the root, then specify the suffix -
en, and the locant of the triple - before the suffix -in (- in). If
there are two, three or more identical substituents, the positions of
each of them are indicated by locators, and their number is
denoted by prefixes di (d), three, tetra, penta, etc.
Examples of names of organic compounds according to the
systematic nomenclature.

а) H C CH CH CH б) CH 2 CH 2
3 3 b)
CH CH
CH CH 2 2
3 3

в) H C C CH C CH 3 d) г) H 2 C C CH 2 CH CH 2 CH 3
c) 2 C H
CH CH CH 3 2 5
3 3

д) H C CH C C CH 2 CH 3
e) 2
O
f) е) H C CH CH CH CH C
3 2 2 OH
OH CH
3
CH
3
O
g) є) H 3 C CH CH 2 C CH 2 CH C H
NH Cl CH
2 3

Answers:

a) 2,3- dimethylbutane;
b) cyclobutane;