Question

H3C–CH = CH–CH3
HC ≡ C–CH3

Answer 1

H3C–CH = CH–CH3. :----but-2-ene

HC ≡ C–CH3 :--------propyne

Answer 2

Heyaa☺
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▶The IUPAC name of the compounds are⤵⤵

1) But-2-ene

2) Propyne.

Here in (1)

▶The root word is 4=But and have double at the place of 2.

In (2)

▶The root word is 3 = prop and have triple bond (yne) at first place.

▶In the both compounds the first priority goes to bonds.

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Hope you understand...✌
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