Hydrocarbon MCQ quiz SH1

The reaction between methylbenzene and ethanoyl chloride is similar to the reaction between methylbenzene and chloroethane.

The reaction proceeds via several stages with two successive intermediates.

What could be the intermediates for this reaction?

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Use of the Data Booklet is relevant to this question.

 

The reaction of methylpropane with a halogen, X₂, produces a halogenoalkane.

 

(CH₃)₃CH + X₂ → (CH₃)₃CX + HX

Which statement about this reaction is correct?

• C₄H₉X is formed in one of the propagation reactions.

• Small amounts of (CH₃)₃C• are produced in a termination reaction.

• The Br–Br bond is weaker than the Cl–Cl bond and so the reaction with bromine is more exothermic.

• The initiation reaction produces a halide ion which is reactive.

Which statement about propene explains how it reacts with bromine?

• Electrons in the carbon–carbon π bond are donated to an electrophile.

• Electrons in the carbon–carbon σ bond are donated to an electrophile.

• The sp² hybridised carbon is an electrophile and accepts a pair of electrons.

• The σ bond between the sp² hybridised carbon atoms is weak and readily broken.

Methylbenzene reacts with bromine chloride, BrCl, in different ways, depending on the conditions used.

 

A reaction is carried out using an excess of methylbenzene in the absence of sunlight and in the presence of an iron-containing catalyst.

 

What is the main reaction taking place?

• substitution of one bromine atom into the –CH₃ side-chain

• substitution of one chlorine atom into the –CH₃ side-chain

• substitution of one bromine atom into the benzene ring

• substitution of one chlorine atom into the benzene ring

What is the intermediate in the following reaction?

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The three compounds E, F, and G have the following structures:

Which statements about E, F, and G are correct?

1. 1. E and G have the same empirical formula.

2. 2. E and F are isomers.

3. 3. The Mr​ of F is exactly twice that of G.

• 1, 2 and 3 are correct

• 1 and 2 only are correct

• 2 and 3 only are correct

• 1 only is correct