What is the name of this molecule?

A straight chain of four carbons. There is a triple bond between the second and third carbons when counting from left to right or right to left.

Question

What is the name of this molecule?

A straight chain of four carbons. There is a triple bond between the second and third carbons when counting from left to right or right to left.

frostbite · Answer

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This one?

anonymous · Answer

CH3-Ctriple reacts with C-CH3

frostbite · Answer

You can just make a structure formula next time: CH3CCCH3.
Anyway the molecule I've drawn and written above is called but-2-yne.

anonymous · Answer

Wait can you explain a bit further? sorry

frostbite · Answer

Explain what? How I got to the name?

anonymous · Answer

yes please

frostbite · Answer

Sure. I use the IUPAC rules so what we are going to be looking at first is how long the carbon chain is (the longest one, but we only got one in this case).
We notice that it contain 4 carbon and start by naming it like was it an alkan. You know what the name would be?

frostbite · Answer

You know the names methane, ethane, propane, butane pentane?

anonymous · Answer

yes!

frostbite · Answer

Good. Well we take the butane (4 C) but then we need to include the suffix for a triple bond which is "yne" and we see that the triple bond start on C #2, So we call it:
But-2-yne.

frostbite · Answer

we simply remove "ane" and insert "yne"