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Worksheets*PHYSICAL PROPERTIES OF ORGANIC COMPOUNDS (SERIES 2)*
Total questions: 20
Worksheet time: 40mins
Which are the correct order of increasing acidity for the following compound?
Water, Ethanol, Phenol
Water < Ethanol < Phenol
Phenol < Ethanol < Water
Ethanol < Water < Phenol
Water < Phenol < Ethanol
Which carboxylic acid is most acidic?
CH3CH2CH2COOH
CH3CH2CH(Cl)COOH
CH3CH(Cl)CH2COOH
ClCH2CH2CH2COOH
In acidicity, phenol release proton to water produce:
Carboxylate ion
Phenoxide ion
Alkoxide ion
Phenolate ion
Choose INCORRECT statement why phenol is more acidic than ethanol
negative charge of ethoxide ion is localised on oxygen atom
phenoxide ion is stable than ethoxide ion
Present of electron donating group of phenol
Negative charge of phenoxide ion can be delocalised into benzene ring
Which of the following compound is expected to be most basic?
Aniline
Ammonia
p-nitroaniline
Ethylamine
By the presence of a halogen atom in the chain, what is the effect of this on acidic properties of butanoic acid?
Increased
Decreased
Unchanged
Doubled
The correct order of increasing basic strength is
Aniline < p-nitroaniline < NH3 < CH3NH2
Aniline < p-nitroaniline < CH3NH2 < NH3
p-nitroaniline < aniline < NH3 < CH3NH2
p-nitroaniline < aniline < CH3NH2 < NH3
Which of the following lists the compounds in increasing order of acidity?
S: C6H5OH
T: CH3CH2OH
U: CH3COOH
V: CH2ClCOOH
S < T < U < V
T < S < U < V
S < T < V < U
T < S < V < U
Which of the following shows the correct order of increasing basic strength?
X: C6H5NH2
Y: CH3CH2NH2
Z: CH3CH2NHCH3
X < Y < Z
X < Z < Y
Y < X < Z
Z < Y < X
The pKa of methanoic acid and ethanoic acid are 3.74 and 4.74 respectively. This means that;
Methanoic acid is stronger acid than ethanoic acid
Methanoic acid is weaker acid than ethanoic acid
Ethanoate ion is a weaker conjugate base than methanoate ion
Degree of dissociation of methanoic acid is lower than ethanoic acid
When an acid reacts with a metal, which one of the following gas is usually liberated?
Ammonia gas
Chlorine gas
Oxygen gas
Hydrogen gas
The molecular formulae of three organic compounds are given below.
P: CH3COOH
Q: HCOOH
R: ClCH2COOH
Which arrangement is a correct order of increasing acidic strength?
P < Q < R
P < R < Q
R < P < Q
Q < R < P
Which of the following statement is true about methanamine?
methanamine is slightly acidic
methanamine is less basic than NH3
methanamine is stronger base than NH3
methanamine forms salts with alkali
Which of the following has the highest value of dissociation Ka
CH3CH2COOH
CH3CHClCOOH
ClCH2CH2COOH
CH3CCl2COOH
Which of the following is the correct order of decreasing acidity?
J: FCH2COOH
K: CH3COOH
L: F2CHCOOH
M: ClCH2COOH
J < K < L < M
K < M < J < L
L < M < J < K
M < K< J < L
Which pair of organic compound FALSE with their stable ion
phenol - phenoxide ion
alcohol - alkoxide ion
carboxylic acid - carboxylate ion
benzoic acid - benzic ion
Which of the compound more acidic?
butanol
ethanoic acid
phenol
cyclohexanol
Why phenol more acidic than aliphatic alcohols? Give the reasons.
Factor of inductive effect
Factor of resonance effect
Factor of electron withdrawing group (EWG)
Factor of electron donating group (EDG)
Why N,N-dimethylethanamine more basic than 1-butanamine?
the present of resonance effect
the present of more electron withdrawing group (EWG)
the present of more electron donating group (EDG)
the present of Nitrogen effect
Which of the group, electron withdrawing group (EWG)?
nitro group (-NO2)
alkyl group (-R )
halogen group (-Cl2/ -Br2/ -F2/ -I2)
Hyroxyl group (-OH)
