How will u distinguish between??
1)propene and propane
2)1-butene and 1-butyne
3)2-butene and 2-butyne
4)formaldehyde and acetaldehyde
1) Differ by the presence of the double bond (in the reaction with potassium permanganate propene discolors it) 2) The first carbon atom in butene - 1 has double bond, butyne- 1 has& triple bond. 3) In the second carbon atom in the butene - 2 there is double bond, butyn-2 has& triple bond. 4)In acetaldehyde there's one methyl group more than in formaldehyde.