organic:alkenes

Question 1

what is the mechanism for the reaction of cyclohexene with Br2

Answer 1

electrophilic addition

Question 2

why is there an attraction between a C=C double bond and Br2

Answer 2

C=C has a high electron density so Br2 becomes polarised. the delta positive Br is attracted to C=C double bond

Question 3

what is the mechanism of reaction 3-chloroprop-1-ene with sodium hydroxide

Answer 3

nucleophilic substitution

Question 4

what is the mechanism of he reaction of 1,3-propanediol and acid catalyst to form prop-2-en-1-ol

Answer 4

acid elimination

Question 5

what would u observe is bromine water was added to polychloroethene

Answer 5

no reaction as it is saturated

Question 6

why are plasticisers added to PVC

Answer 6

make it more flexible

Question 7

what is the mechanism of propene and sulfuric acid

Answer 7

acid elimination

Question 8

explain why two products can form in different amounts

Answer 8

major product is formed by a tertiary carbocation intermediate and minor is formed from a secondary carbocation intermediate. tertiary carbocation is more stable than secondary carbocation.