What s wrong with the following iupac name
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What’s wrong with the following IUPAC name?. Tetraaminecopper(II) ion. Correct IUPAC name. Tetraamminecopper(II) ion ammine, not amine. What’s wrong with the following IUPAC name?. 2-Methylpentan-2,4-diol. Correct IUPAC name. 2-Methylpentan e -2,4-diol.

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Correct iupac name
Correct IUPAC name

Tetraamminecopper(II) ion

ammine, not amine



Correct iupac name1
Correct IUPAC name

2-Methylpentane-2,4-diol



Correct iupac name2
Correct IUPAC name

3,7-dimethyloct-6-enal



Correct iupac name3
Correct IUPAC name

trans-1,2-dibromocyclohexane















Correct structure7
Correct structure

Nitronium ion





















Correct representation7
Correct representation

[Co(H2O)6]2+ 2Cl-


What s wrong with the following representation10
What’s wrong with the following representation?

Cell diagram of the standard electrode potential of Cu2+(aq)/Cu(s) couple

Pt(s) /H2(g) /2H+(aq)  Cu2+(aq) /Cu(s)

E o = +0.34V


Correct representation8
Correct representation

Cell diagram of the standard electrode potential of Cu2+(aq)/Cu(s) couple

Pt(s) /H2(g, 1atm) /2H+(aq, 1M)  Cu2+(aq, 1M) /Cu(s)

E o = +0.34V



Correct representation9
Correct representation

“Fish-hook arrow/ half arrow“ to represent flow of an odd electron.



Correct representation10
Correct representation

Curly arrows flows from –ve charge center to +ve charge center.



Correct representation11
Correct representation

“” to represent resonance



Correct representation12
Correct representation

Negative inductive effect of F

“ ” to represent inductive effect



Correct representation13
Correct representation

1s2 2s2 2p6 3s2 3p6 3d2 4s2

Electronic configuration should be in ascending order of principal quantum no


What s wrong with the following representation16
What’s wrong with the following representation?

Enthalpy change of combustion of nitrogen = 40 kJ mol-1


Correct representation14
Correct representation

Enthalpy change of combustion of nitrogen = +40 kJ mol-1

+ve/-ve sign should be included in the H values of endothermic/exothermic enthalpy changes


What s wrong with the following representation17
What’s wrong with the following representation?

Enthalpy Change of formation of water:

H2 + O2 H2O H = -420 kJ mol-1


Correct representation15
Correct representation

Enthalpy Change of formation of water:

H2(g)+ ½O2(g) H2O(l) H = -420 kJ mol-1

Equations should be balanced.

Physical states should be included in thermochemical equations.


What s wrong with the following representation18
What’s wrong with the following representation?

Partial pressure of H2– [H2(g)]


Correct representation16
Correct representation

Partial pressure of H2– PH2(g)

[ ] – concentration expressed in terms of mol dm-3


































Correct products1
Correct products

Phenol is less acidic than H2CO3,

but more acidic than HCO3-.


What s wrong with the following equation16
What’s wrong with the following equation?

Two dipeptides can be formed from 2-aminoethanoic acid and 2-aminopropanoic acid










What s wrong with the following reaction conditions
What’s wrong with the following reaction conditions?

using AgNO3(aq) to detect chloride ion


Correct reaction conditions
Correct reaction conditions

using AgNO3(aq) + HNO3(aq)

to detect chloride ion


What s wrong with the following reaction conditions1
What’s wrong with the following reaction conditions?

using glowing splint to detect hydrogen;


Correct reaction conditions1
Correct reaction conditions

using burning splint in the test of hydrogen


What s wrong with the following reaction conditions2
What’s wrong with the following reaction conditions?

using BaCl2(aq) to detect sulphate ion


Correct reaction conditions2
Correct reaction conditions

using BaCl2(aq) + HCl(aq)

to detect sulphate ion


What s wrong with the following reaction conditions3
What’s wrong with the following reaction conditions?

using LiAlH4, water in the reduction of carbonyl compounds


Correct reaction conditions3
Correct reaction conditions

using LiAlH4, etherin the

reduction of carbonyl compounds

LiAlH4 + 4H2O  Li+ + Al3+ + 4OH- + 4H2


What s wrong with the following reaction conditions4
What’s wrong with the following reaction conditions?

using NaNO3(s) + HCl(aq)

in the azotization of aromatic amines


Correct reaction conditions4
Correct reaction conditions

using NaNO2(s) + HCl(aq)(<5oC)

in the azotization of aromatic amines


What s wrong with the following description
What’s wrong with the following description?

in Lucas Test (to distinguish 1o, 2o & 3o alcohol), 3o alcohol forms precipitate readily as alkyl halide is immiscible with water


Correct description
Correct description

in Lucas Test (to distinguish 1o, 2o & 3o alcohol), 3o alcohol turns turbid readily as alkyl halide is immiscible with water.


What s wrong with the following description1
What’s wrong with the following description?

Landfilling is an appropriate disposal method for PVC.


Correct description1
Correct description

Landfilling is not regarded as an appropriate disposal method for PVC because PVC is non-biodegradable;

The proper way is by incineration (with adequate supply of air at sufficient higher temperature) and treat the flue gas in wet scrubber with Na2CO3(aq).


What s wrong with the following description2
What’s wrong with the following description?

first emission line in the Balmer series involves electronic transition between n = 2 to n = 0.


Correct description2
Correct description

quantum number can have values 1,2,3 etc; first emission line in Balmer series involves electronic transition between n = 3 to 2; convergence limit in Balmer series involves electronic transition between n = infinity to 2.








What s wrong with the following expression3
What’s wrong with the following expression?

The decay of carbon-14 starts after the death of living things.


Correct expression3
Correct expression

The ratio of carbon-12 and carbon-14 remains unchanged in a living organism, but decreases slowly after the death of living things.


What s wrong with the following expression4
What’s wrong with the following expression?

In paper chromatography, cellulose in the filter paper is the stationery phase.


Correct expression4
Correct expression

In paper chromatography, the thin film of water on the chromatography paper acts as the stationary phase and that partition is the underlying principle of paper chromatography.


What s wrong with the following expression5
What’s wrong with the following expression?

criteria in choosing an indicator – pH range of colour change close to the equivalence point


Correct expression5
Correct expression

criteria in choosing an indicator – the pH range of colour change of the indicator falls into the steepest part of the titration curve/ pKi is very close to the pH of the solution at equivalence point.


What s wrong with the following expression6
What’s wrong with the following expression?

A rise in temp increases the forward reaction rate and the equilibrium position shifts to the product side.


Correct expression6
Correct expression

A rise in temp. increases both the forward & backward reaction rates. For endothermic reaction the extent of increase in forward reaction rate is greater than that of backward reaction rate. Thus the position of equilibrium shifts to the product side. In case of endothermic/exothermic reaction, Kc increases/decreases with temp.


What s wrong with the following expression7
What’s wrong with the following expression?

catalyst lowers the activation energy of the reaction.

catalyst increases both reaction rate & yield.


Correct expression7
Correct expression

catalyst provides a new pathway with lower activation energy.

catalyst increases the reaction rate but yield remains unchanged.


What s wrong with the following expression8
What’s wrong with the following expression?

b.p. of H2O > OF2 because intermolecular hydrogen bond exists in water.


Correct expression8
Correct expression

b.p. of H2O > OF2 because intermolecular hydrogen bond exists in waterand van der Waals’ force between OF2.

more energy is needed to overcome hydrogen bond, accounting for the higher boiling point.


What s wrong with the following expression9
What’s wrong with the following expression?

Boiling point of H2O > H2S because O is more electronegative and forms stronger hydrogen bonding.


Correct expression9
Correct expression

Boiling point of H2O > H2S

because O is more electronegative

intermolecular hydrogen bond in H2O

Van der Waals’ forces in H2S is weaker

more energy is needed to overcome hydrogen bond, accounting for the higher boiling point.


What s wrong with the following expression10
What’s wrong with the following expression?

hcp, fcc and bcc are close-packing arrangement.


Correct expression10
Correct expression

Hexagonal close-packing and face-centred cubic close-packing have the maximum co-ordination number, which is equal to 12. Body-centred cubic has open structure and the coordination number is equal to 8.


What s wrong with the following expression11
What’s wrong with the following expression?

NaCl has ‘face-centred cubic structure’ and CsCl has ‘body-centred cubic structure’


Correct expression11
Correct expression

In NaCl, both Na+ and Cl- ions adopt face-centred cubic lattices, which interpenetrate each other. The structure shows 6:6 coordination.

In CsCl, both Cs+ and Cl- ions adopt simple cubic lattices, which interpenetrate each other. The structure shows 8:8 coordination.


What s wrong with the following expression12
What’s wrong with the following expression?

oxidative rancidity of oils and fats involve RCOO.


Correct expression12
Correct expression

oxidative rancidity of oils and fats involve alkylperoxyl radical (ROO.) but not the carboxyl radical (RCOO.);


What s wrong with the following expression13
What’s wrong with the following expression?

The functional group in benzoic acid is ‘alkanoic acid’ and ‘alkanol’ is the functional group of phenol.


Correct expression13
Correct expression

‘Carboxylic acid’ is the functional group of benzoic acid. ‘Hydroxyl group’ is the functional group of phenol.



Correct expression14
Correct expression

Chromium compounds are toxic to aquatic life.



Correct expression15
Correct expression

Aspirin could cause damage to stomach lining.


What s wrong with the following expression16
What’s wrong with the following expression?

Order is the sum of the powers of the concentration terms in the rate equation.


Correct expression16
Correct expression

Order is the sum of the powers of the concentration terms in theexperimentally determinedrate equation.


What s wrong with the following expression17
What’s wrong with the following expression?

Half-life of a first order reaction increases with initial concentration.


Correct expression17
Correct expression

Half-life of a first order reaction is independent of initial concentration or pressure.


What s wrong with the following expression18
What’s wrong with the following expression?

With an alkali, halogen forms halide and halate(V).


Correct expression18
Correct expression

With an alkali, chlorine forms ClO- and ClO3-under different conditions, bromine forms mainly BrO3- with some BrO-, and iodine only IO3-.


What s wrong with the following expression19
What’s wrong with the following expression?

Boric acid is a tribasic acid.


Correct expression19
Correct expression

Boric acid is a monobasic acid.


What s wrong with the following expression20
What’s wrong with the following expression?

CCl4 is stable towards water, but SiCl4 hydrolyses readily in water. This is because C is more electronegative than Si.


Correct expression20
Correct expression

Low-lying vacant orbital is not available in carbon.


What s wrong with the following expression21
What’s wrong with the following expression?

Phenol is more acidic than ethanol because the negative charge on the phenoxide ion can delocalise into the benzene ring.


Correct expression21
Correct expression

Due to the delocalization of the negative charge, the phenoxide ion is stablized. The following equilibrium shifts to the RHS.


What s wrong with the following expression22
What’s wrong with the following expression?

Tertiary carbocation is more stable than the primary carbocation.


Correct expression22
Correct expression

Tertiary carbocation is more stable than the primary carbocation.

Positive inductive effect of the methyl group stabilises the tertiary carbocation.


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