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WorksheetsOCR A Chemistry MCQ questions Y13 organic
Total questions: 22
Worksheet time: 22mins
What is the numberof sigma bonds in a benzene molecule?
3
6
9
12
What is the number of chiral centres in the molecule below?
4
5
6
7
Which compound cannot be hydrolysed?
CH3COOH
CH3COCl
CH3CONHCH3
CH3COOCH3
The compound shown can be prepared from phenol. Which reagent(s) is/are required?
Concentrated NH3
Dilute NH3
Dilute HNO3 and then concentrated HCl / Sn
Dilute HNO3 and then NaBH4
Which reagent could be used to distinguish between CH3CH2OH and C6H5OH?
AgNO3(aq) in ethanol
CH3COCl
Na2CO3(aq)
Bromine water
How many peaks are observed in the 13C NMR spectrum of 1,3-dimethylbenzene?
3
4
5
6
Which compound is used as a standard for NMR chemical shift measurements?
Si(CH3)4
CDCl3
D2O
CCl4
Which compound is a secondary amide?
What is the number of peaks in the 1H NMR spectrum of HOOCCH2CHOHCH2COOH?
3
4
5
6
Benzene reacts with an organic reagent in the presence of a halogen carrier to form phenylethanone. Which organic reagent is required?
CH3CH2OH
CH3CHO
CH3COCl
CH3COOH
How any straight-chain structural isomers of C7H15Cl contain a chiral carbon?
1
2
3
4
A solid organic compound can be purified by recrystallisation. Which statements(s) about recrystallisation is/are true?
1. The organic compound is more soluble in hot solvent.
2. The hot solution is cooled before the purified organic compound is collected.
3. The melting point of the purified organic compound is lower than the impure compound.
1, 2 and 3
Only 1 and 2
Only 2 and 3
Only 1
Which of the following could react with the compound below to form a carbon-carbon bond?
1. CH3Cl and AlCl3
2. KCN in ethanol
3. CH3OH and H2SO4
1, 2 and 3
Only 1 and 2
Only 2 and 3
Only 1
What is the number of chiral carbon atoms in the steroid molecule below?
5
6
7
8
Phenol reacts with bromine. Which is the least likely organic product?
The repeat unit of a polymer is show below. Which monomers could form this polymer?
Which compound shows 4 peaks in its carbon-13 NMR spectrum?
A compound produces the 13C NMR spectrum below. Which compound could have produced this spectrum?
Propane
2-Methylbutane
2-Methylpropan-1-ol
2-Methylpropan-2-ol
A carbonyl compound is reacted with NaBH4. Which compound(s) could be formed?
1. 2-Methylpentan-2-ol
2. 2-Methylpentan-1-ol
3. 3-methylpentan-2-ol
1, 2 and 3
Only 1 and 2
Only 2 and 3
Only 1
Which chemical(s) can react with phenol?
1. Potassium hydroxide
2. Ethanoyl chloride
3. Nitric acid
1, 2 and 3
Only 1 and 2
Only 2 and 3
Only 1
CH3CH2Cl reacts with an excess of ethanolic NH3. Which compound is the main organic product?
CH3CH2NH2
(CH3CH2)2NH
(CH3CH2)3N
(CH3CH2)4N+
Which statement(s) support(s) the delocalised model for the structure of benzene?
1. All carbon-carbon bonds have the same length.
2. The enthalpy change of hydrogenation of benzene is less exothermic than expected.
3. Bromine reacts with benzene less readily than with cyclohexene.
1, 2 and 3
Only 1 and 2
Only 2 and 3
Only 1
