Question

write the molecular formula for an :(1)alkene and (2)alkyne four carbon atom​

Answer 1

1) The general formula for alkenes is CnH2n.

So, the alkene with four carbon atoms will be C4H8 or Butene.

2)The general formula for alkynes is CnH(2n-2).

So, the alkyne with four carbon atoms will be C4H6 or Butyne.

Answer 2

Alkenes have general formula $C_n H_{2n} → C_{4} H_{8}$

Alkynes have general formula $C_n H_{2n-2} → C_{4} H_{6}$