Alkenes

Question 1

What is the general formula for U branched alkenes

Answer 1

CnH2n

Question 2

Are alkenes unsaturated or saturated

Answer 2

Unsaturated

Question 3

What are double bonds in alkenes

Answer 3

Areas of high electron density

Question 4

By which mechanism do alkenes react with hydrogen bromide (HBr), sulfuric acid (H2SO4) and bromine (Br2)

Answer 4

Electrophilic addition

Question 5

What is an electrophile

Answer 5

An electron-deficient species and has a full or small positive charge

Question 6

What is an unsymmetrical alkene

Answer 6

Different groups attached to each of the carbons in the C=C bond

Question 7

What is the product formed by addition reactions of unsymmetrical alkenes determined by

Answer 7

The stability of the intermediate carbocations

Question 8

What is the order of stability of carbocations

Answer 8

Tertiary (most stable)

Primary (least stable)

Question 9

How are addition polymer produced

Answer 9

By the polymerisation of alkenes

Question 10

What is the repeating unit in an addition polymer

Answer 10

Alkene molecule

Question 11

What is ethene polymerised to produce

Answer 11

Poly(ethene)

Question 12

What is propene polymerised to produce?

Answer 12

Poly(propene)

Question 13

What property enables addition polymers enables them to have a range of useful applications

Answer 13

Unreactive

Question 14

How can the properties of polymers be controlled

Answer 14

By the reaction conditions used or by additives