Organic Chemistry question

[AizzaPV]

Hey! Is there a shortcut I could use in this type of question or I just need to draw and infer from that?
Thanks!

[dorsa_vaezi]

Hey!
Here’s the formula:
2^(n-4) +1

[callearaya]

In n the number of carbons?

[hassanzrizvi]

Yess… and the answer would be 3.

=2^(n-4)+1
=2^(5-4)+1
=2^1+1
=2+1
=3

[callearaya]

Is there a different equation for alkene compounds? Thanks!

[dorsa_vaezi]

You should draw them