Answer to Question #135948 in Organic Chemistry for Saad

Question

Write the molecular formula for Cn Hm

Answer 1

C_nH_m .

1 . if this is alkane then m = 2n + 2 .

And formula is C_nH_2n+2 .

Example = if n=1 . then CH₄ .

if n= 2 then C₂H₆ .

if n=3 then C₃H₈ .

2 . if this is alkene then m = 2n .

And formula is C_nH_2n .

Example = .

if n= 2 then C₂H₄ .

if n=3 then C₃H₆ .

3 . if this is alkyne then m = 2n - 2 .

And formula is C_nH_2n-2 .

Example =

if n= 2 then C₂H₂ .

if n=3 then C₃H₄ .