M6S9 – Organic Summary

Organic Summary

1 / 10

Free-radical intermediates in the reaction of chlorine with methane include:

(i) CH₃^.

(ii) H^.

(iii) Cl^.

(iv) C^.

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

2 / 10

The rate equation for the reaction of hydroxide ions with 2-bromo-2-methylpropane takes the form:

rate = k[C₄H₉Br].

This indicates that:

(i) the rate determining step involves hydroxide ions

(ii) doubling the concentration of the halogenoalkane doubles the rate of reaction

(iii) the reaction takes place in one step

(iv) the reaction takes place by the S_N1 mechanism (a 2 step mechanism)

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

3 / 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

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

4 / 10

Which of these reagents are nucleophiles?

(i) Br₂

(ii) NH₃

(iii) NO₂⁺

(iv) CN^-

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

5 / 10

Which of these reactions involve heterolytic bond breaking

(i) propene with bromine

(ii) benzene with bromine

(iii) bromobutane with ammonia

(iv) ethane with bromine

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

6 / 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

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

7 / 10

The nitrating agent for benzene is a mixture of concentrated sulfuric and nitric acids. This mixture produces:

the free radical NO

the nucleophile NO₂^-

the free radical NO₂

the electrophile NO₂⁺

8 / 10

When propene react with hydrogen bromide the main intermediate is:

CH₃-CH₂-C⁺H₂

CH₃-CHBr-C⁺H₂

CH₃-C⁺H-CH₂Br

CH₃-C⁺H-CH₃

9 / 10

The relative rates of hydrolysis for these halogenoalkanes are in the order

C₄H₉I > C₄H₉Br > C₄H₉Cl

This trend correlates with the:

polarity of the C-halogen bonds

energy needed to break the C-halogen bonds

the charges on the halide ions

the strength of the halogens as oxidising agents

10 / 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:

CH₃CH₂CO-¹⁸OC₂H₅

CH₃CH₂-¹⁸OH

CH₃C¹⁸O-OH

CH₃CO-¹⁸OH

Thank you for taking the quiz. Please fill in the fields below and you will receive your results in an email.

If you have been set this as homework, you should forward this email to your teacher as evidence you have completed the quiz.

If you don't receive your email please check your spam or junk folder.

Your score is

0%

Recent Posts

Categories