C15 P2

Question 1

Explain why the boiling point of H2S2 is lower than H2O2

Answer 1

O is more electronegative than S
No hydrogen bonding between h2s2 molecules and only has vdw

Question 2

Suggest one important substance manufactured on a large scale from propene

Answer 2

Polypropene

Question 3

Suggest one important substance manufactured on a large scale from propene

Answer 3

Polypropene

Question 4

How to differentiate using a test for MgCl2 and BaCl2

Answer 4

Use NaOH
MgCl2 - White ppt
BaCl2 - Colourless

Question 5

In the upper atmosphere it is more likely for CBrF3 to produce atoms than it is for CClF3 to produce chlorine atoms, why?

Answer 5

C-Br breaks more easily than C-Cl

Question 6

The reaction is zero order with respect to B
State the significance of this zero order for the mechanism of the reaction

Answer 6

Slow step

Question 7

Give a reducing agent for NO2 -> NH2

Answer 7

H2/Ni

Question 8

Give order of strength of carbon bond lengths including benzene

Answer 8

Double bond, benzene bond, single bond

Question 9

What is the molecular formula of the standard used in 13Cnmr spectroscopy and why its used

Answer 9

C4H12Si
volatile and produces only one single peak