Question

Convert the condensed formula HCCCH(CH₃)₂ into its expanded structure. Be sure to draw all hydrogen atoms. Draw the expanded structure.

Answer 1

The condensed formula HCCCH(CH₃)₂ expands to CH₂-C≡C-CH(CH₃)₂, where all carbon atoms have a total of four bonds, satisfying the valency rules.

Step-by-step explanation:

To convert the condensed formula HCCCH(CH₃)₂ into its expanded structure, we need to draw out all the bonds between carbon and hydrogen atoms while ensuring that each carbon atom forms four bonds.

1. Starting with the first carbon atom (on the left), it is bonded to another carbon and has two hydrogens, so it becomes CH₂.
2. The second carbon is triple-bonded to the third carbon, implying no hydrogens attached directly to it, representing it as C.
3. The third carbon, triple-bonded to the second, also has no attached hydrogen and is represented as C.
4. The fourth carbon is single-bonded to three hydrogens and one CH₃ group from the (CH₃)₂, so it becomes CH with two CH₃ groups attached.
5. The structure thus expands to CH₂-C≡C-CH(CH₃)₂.

In this expanded structure, all carbon atoms have four bonds and all hydrogens are shown.