Prepared by:
Ridwan Abrar
B.Sc. in EEE (BUET), MSc in EEE (ongoing)
Department of Electrical & Electronics Engineering (EEE)
Bangladesh University of Engineering & Technology
(BUET)
Grade in A level Chemistry: A* , Overall: 272/300
Unit 6: 60/60
,Content:
1. Transition Metal
2. Organic Chemistry
Transition metals
Jan 18, Q 5
Explanations:
a) Total charge of L2 = -4. Charge of L is -2.
b) Neutral ligand, so the only charge will be the charge of the complex in.
A is your answer
Prepared by Ridwan Abrar
,Note: Remember that copper and chromium are exceptions when it comes to writing
their electronic configuration in the spdf notation.
Cr= …. 4s1 3d5
Cu = …. 4s1 3d9
Prepared by Ridwan Abrar
, Differences between ligand exchange and deprotonation:
A deprotonation reaction occurs when water (added to the complex ion) loses a proton to
become a hydroxide (OH) ion.
A ligand exchange reaction occurs when the existing ligands with the complex ion are totally
replaced.
Q. Which of the following can’t disproportionate?
A Cl 2
B BrO-
C SO32-
D NO3-
Explanation:
In Cl2 , chlorine has a valency of 0. It can change to -1 or +1 valency.
In NO3- , nitrogen has a valency of ‘+5’ . It can change to a lower valency, but can not move
to a higher valency. So NO3- can not disproportionate.
Q. Which of these complex ions could exist as stereoisomers?
A [Co(NH 3)6]3+
B [Co(NH3)5(H2O)]3+
C [Co(NH3)5(Cl)]3+
D [Co(NH3)4(Cl)2]+
Explanation:
Remember that for stereoisomerism, there must be :
i) At least 2 different ligands
ii) 2 molecules of each ligand
This is only possible with option D.
Option A has only 1 ligand, Option C & D has only 1 molecule of a ligand.
Prepared by Ridwan Abrar
Ridwan Abrar
B.Sc. in EEE (BUET), MSc in EEE (ongoing)
Department of Electrical & Electronics Engineering (EEE)
Bangladesh University of Engineering & Technology
(BUET)
Grade in A level Chemistry: A* , Overall: 272/300
Unit 6: 60/60
,Content:
1. Transition Metal
2. Organic Chemistry
Transition metals
Jan 18, Q 5
Explanations:
a) Total charge of L2 = -4. Charge of L is -2.
b) Neutral ligand, so the only charge will be the charge of the complex in.
A is your answer
Prepared by Ridwan Abrar
,Note: Remember that copper and chromium are exceptions when it comes to writing
their electronic configuration in the spdf notation.
Cr= …. 4s1 3d5
Cu = …. 4s1 3d9
Prepared by Ridwan Abrar
, Differences between ligand exchange and deprotonation:
A deprotonation reaction occurs when water (added to the complex ion) loses a proton to
become a hydroxide (OH) ion.
A ligand exchange reaction occurs when the existing ligands with the complex ion are totally
replaced.
Q. Which of the following can’t disproportionate?
A Cl 2
B BrO-
C SO32-
D NO3-
Explanation:
In Cl2 , chlorine has a valency of 0. It can change to -1 or +1 valency.
In NO3- , nitrogen has a valency of ‘+5’ . It can change to a lower valency, but can not move
to a higher valency. So NO3- can not disproportionate.
Q. Which of these complex ions could exist as stereoisomers?
A [Co(NH 3)6]3+
B [Co(NH3)5(H2O)]3+
C [Co(NH3)5(Cl)]3+
D [Co(NH3)4(Cl)2]+
Explanation:
Remember that for stereoisomerism, there must be :
i) At least 2 different ligands
ii) 2 molecules of each ligand
This is only possible with option D.
Option A has only 1 ligand, Option C & D has only 1 molecule of a ligand.
Prepared by Ridwan Abrar
