What is the IUPAC Name for CH3CH2=CCH3

Question

alif · Answer

The IUPAC name for CH3CH2=CCH3 is 2-pentyne.

abb0t · Answer

Wrong.

alif · Answer

Oh I think I realize my error pardon me. I read the question incorrectly. But Just rereading  @abb0t, I'm not sure but isn't the structure not written correctly. Because I thought carbon can only have a total of four bonds. 

should the structure be something like: CH3CH=CHCH3.

abb0t · Answer

You could assume that's a triple bond since there's only one C there, but the prefix is not PENT.

alif · Answer

yah the prefix should be but-
because there is 4  number of Carbons

alif · Answer

@abb0t since you snuck your foot in earlier. Would you mind helping with figuring out answer. I think I just confused the asker?

abb0t · Answer

If they have any questions, they will ask.

alif · Answer

alright

anonymous · Answer

Its supposed to be a triple bond