AS.11 Alkanes

Question 1

Orbitals in Alkanes

Answer 1

Orbitals overlap end-on to form sigma bonds

Question 2

Small vs larger alkane molecule boiling point

Answer 2

Smaller has lower number of electrons and less surface area contact points
therefore weaker London forces
Less energy required to remove
Lower boiling point

Question 3

Straight vs branched chain alkane boiling point

Answer 3

Same molar mass and same number of electrons
Straight chain has more surface area contact points
Stronger London forces
More energy required
Higher boiling point

Question 4

Problems with radical substitution

Answer 4

1) multiple products from T stage
2)substitution can happen anywhere on chain
3)multiple substitution