1) ch3-ch2-ch-ch2-ch2-ch2-ch3
I
сh3
ch3
ch3 -c-c≡c
ch3-ch-ch3
oh
ch3-ch-ch-cho
I I
ch3 ch3
ch3-ch2-c-ch2-ch2-cooh
1) ch3-ch2-ch-ch2-ch2-ch2-ch3
I
сh3
ch3
I
ch3 -c-c≡c
I
ch3
ch3-ch-ch3
I
oh
ch3-ch-ch-cho
I I
ch3 ch3
ch3
I
ch3-ch2-c-ch2-ch2-cooh
I
ch3