Organic Chemistry & Analysis Random Retrieval

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Organic Chemistry & Analysis Random Retrieval

This quiz contains all the questions in the Organic Chemistry & Analysis section. The website will pick 10 questions at random.

1 / 10

When ethene reacts with bromine in the presence of aqueous sodium chloride the organic products include:

(i) CH2BrCH2Br

(ii) CH2BrCH2Cl

(iii) CH2ClCH2Br

(iv) CH2ClCH2Cl

2 / 10

The reaction of benzene with ethanoyl chloride in the presence of aluminium chloride

(i) involves CH3-CO+ as an intermediate

(ii) forms C6H5-CO-CH3

(iii) is a substitution reaction

(iv) involves nucleophilic attack on benzene

3 / 10

NOT ON OCR SPEC. Hint: Esters can be hydrolysed and the initial stage in the mechanism is nucleophilic attack using an oxygen lone pair of the water molecule. RO- is the leaving group and becomes ROH.

18O is a ‘radiolabelled oxygen’.

The reaction of ethyl ethanoate with H218O produces:

4 / 10

Which of these chemical species are electrophiles which add to alkenes?

(i) bromine molecules

(ii) sulfuric acid molecules

(iii) hydrogen bromide molecules

(iv) sulfate ions

5 / 10

Mixing poly(chloroethene) with a plasticiser makes is suitable for use as:

(i) window frames

(ii) insulation for electric cables

(iii) water pipes

(iv) waterproof clothing

6 / 10

Which of these characteristics of polymers accounts for the difference between low density and high density poly(ethene)?

[1] the average length of the polymer chains

[2] the type of intermolecular (interchain) forces

[3] the number and size of bulky side groups

[4] the extent of chain branching

7 / 10

Which of these repeat units gives rise to a polymer which is soluble in water:

8 / 10

Which of these molecules does NOT consist of one or more chains of amino acids?

(i) The hormone insulin

(ii) The filaments in muscle fibres

(iii) The enzyme in saliva, amylase

(iv) The genetic material, DNA

9 / 10

In the synthesis of ethylamine from bromoethane, the reaction is performed at a high pressure with a large excess of ammonia. The principal reason(s) for this include :

(i) increasing the rate of the reaction

(ii) to minimise the chance of diethylamine and triethylamine being produced

(iii) to push the equilibrium to the right, away from the ammonium salt towards the free amine.

(iv) to reduce the activation energy for the process

10 / 10

Which of these aldehydes are isomers of pentan-2-one?

(i) pentanal

(ii) 2-methylbutanal

(iii) 3-methylbutanal

(iv) 2,2-dimethylbutanal

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