Question

with bromne 2. Why is the reaction of ethere Called an additonal reaction? 3. If you used a bromine test to distinguish between hexane and there are hexene in which would the red color or bromine Persist? distinguish would 4. If you used a permanganate test to between hexane and I hexene, in which the purple Color of knna perast? 5. or Draw the the Condensed Structrual formula of each. following. a. 2-methyl-1-pentene b. 3-methyl Cyclopentene

Answer 1

• Alkenes react in the cold with pure liquid bomine, the double bond breaks and bromine atom becomes attached to each caebon. The . biomine loses its original red-brown color to give a colourless lignid. . In case of reaction with ethene 1,2.dibromo ethane is formed. -CH2 2 CH₂CH₂CH₂-C42 -BaBy - Br Br ts Bra In to each called this reaction Bromine atom is attached carbon atom without substitution hence addition reaction... n5.3. Explaination - . - Bromise test is done to distinguish between the unsaturated hydrocarbons n saturated wyd coca-ebons. 1. When we add bromine water to unsatreated hydrocarbon, bromine atoms get attached to the carbons with double bond in between. This reaction between bromine water and unsaturated hydrocarbon results in decolorization comine watez coloy com red to colourless. - When bomine watez is added to 2-hexene color change will be observed CH₂-CH=CH-Cghty + Br, CH₂-Ch Br-ChBryty

re no color When bromine water is added to hexanse no change will be obsewed. C6H14 + Bra - no reaction. Dhexene. Ans.al When permanganate reacts with allanes (2-hexene), it produce brown coloz. C4-cy-cy-01-01=04 permangane. 30 fod ych oh e oxidising agent on on 1,2-hexanediol, But the purple color ok km nou will persist on hexane . since hexane i alkane, the color will stay after reaction. Ans.s Condensed structure - a. 2-methyl-l-pentene 03 A _CH-CHD-CCers)C12 b. 3-methyl cyclopentene