Give the general formula for any dialkene; that is, a straight-chain hydrocarbon with two double bonds along the chain. (Type your answer using the format CnHn+1 for CnHn+1.)

Question

I know just alkene would be CnH2n but im not sure how to make it with the dialkene.

can any1 help me?
thanks!!

Answer 1

draw some

cH3-cH2-cH=cH-cH=cH2

note on the ends, there are 3H
one each double bond, each C has one less H (each side)

CnH(2+2n-4) check that above n=6, byt this formula C6H10 counting... 6c, 10H

now the check
CH2=CH-CH2-CH=CH2
formula: C5H8
count: C5H8

CnH(2n-2) Try that.

Answer 2

oh. that wasn't the correct answer

Answer 3

Try some. The general formula for a dialkene is the same as the general formula for an alkyne isn't it. CnH2n-2.
I wrote about six or 7 straight chain hydrocarbons, stuck a couple double bonds in each, added H atoms to make up the quadrivalent C each, and voila! All of them worked with CnH2n-2.

Answer 4

i tried the answer in my online hw and it said it was wrong. i am looking in my text book and CnH2n-2. the answer you guys are saying is the formula for alkynes.

but i need to find the formula for dialkene.

the formula for just alkene is CnH2n. but i don't know how to make that into the di part of dialkene