Organic Chemistry: Alkenes

Question 1

What is the general formula of alkenes?

Answer 1

CnH2n

Question 2

Shape of bond
Bond Angle

Answer 2

Trigonal planar
120

Question 3

Why does E/Z isomerism occur?

Answer 3

Due to the restricted rotation of the planar C=C doublebond

Question 4

Why are alkenes reactive?

Answer 4

Due to the high electron density of the C=C double bond

Question 5

Why does E/Z isomerism occur?

Answer 5

Due to the restricted rotation of the planar C=C double bond

Question 6

Define electrophile

Answer 6

Electron pair acceptor

Question 7

How do halogen molecules react with alkenes?

Answer 7

Halogen acts as an electrophile
High electron density in the C=C double bond induces a temporary dipole in the halogen molecule
Halogen accepts the electrons (X- ion forms)
The X-X bond breaks due to heterolytic fission
Lone pair of electrons on halogen ion forms a new C-X bond with the carbocation

Question 8

Name of the mechanism of alkenes to halogenoalkanes

Answer 8

Electrophilic addition

Question 9

Order of stability of carbocations

Answer 9

3°>2°>1°

Question 10

Which product would be the major product?

Answer 10

The product that has been formed from the carbocation with the most stability