Lesson 3.3.11.3
3.3.11.3 Nucleophilic properties Quiz: AQA Chemistry, Unit 3
20 questions
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Lesson 3.3.11.3, Nucleophilic properties: 20 multiple choice questions for the AQA Chemistry (7405), Unit 3: Organic chemistry, written with Revision Ninja.
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The 20 questions
-
What feature allows amines to act as nucleophiles?
- Aromatic ring
- Positive charge
- C-N bond
- Nitrogen lone pair
-
What is the main first product when excess ammonia reacts with a halogenoalkane?
- A quaternary ammonium salt
- A tertiary amine
- An amide
- A primary amine
-
How many alkyl groups are bonded to nitrogen in a quaternary ammonium salt?
- One
- Two
- Three
- Four
-
What are quaternary ammonium salts used for in the specification?
- Dye intermediates
- Polyalkene manufacture
- Biodiesel fuel
- Cationic surfactants
-
What product forms when a primary amine such as methylamine reacts with ethanoyl chloride?
- Methyl ethanoate
- Ethanamide
- Ethanoic acid
- N-methylethanamide
-
Which mechanism occurs when ammonia reacts with bromoethane?
- Electrophilic substitution
- Nucleophilic substitution
- Nucleophilic addition
- Electrophilic addition
-
What is the product when ethylamine reacts with bromoethane?
- Diethylamine
- Tetraethylammonium bromide
- Triethylamine
- Ethanamine
-
What organic product forms when triethylamine reacts with excess bromoethane?
- Triethylammonium bromide
- Diethylammonium bromide
- Ethylammonium bromide
- Tetraethylammonium bromide
-
Why is ethylamine a stronger nucleophile than phenylamine?
- Electron-withdrawing phenyl group
- Smaller nitrogen atom
- Steric hindrance
- Electron-donating alkyl group
-
Why is excess ammonia used when preparing a primary amine from a halogenoalkane?
- Speeds up hydrolysis
- Prevents elimination reactions
- Prevents further substitution
- Increases reaction temperature
-
Which species acts as the nucleophile when ammonia reacts with bromoethane?
- Ammonia
- Bromoethane
- Bromide ion
- Ethyl carbocation
-
What is the leaving species in the addition-elimination reaction of ammonia with ethanoyl chloride?
- Chloride ion, Cl-
- Hydride ion, H-
- Ammonium ion, NH4+
- Hydroxide ion, OH-
-
Why are acyl chlorides used instead of carboxylic acids to form amides?
- Less electrophilic
- More reactive
- Less reactive
- Stronger bases
-
What forms when excess primary amine reacts with the hydrogen chloride produced during acylation?
- Acid chloride
- Carboxylic acid
- Ester
- Ammonium salt
-
What charge is present on the hydrophilic head of a cationic surfactant?
- Variable charge
- Positive charge
- Neutral charge
- Negative charge
-
What feature gives a quaternary ammonium ion its permanent positive charge?
- Two double bonds
- Delocalised ring electrons
- Four nitrogen-carbon bonds
- Unbonded lone pair
-
Which atom acts as the electrophile in an acyl chloride during reaction with an amine?
- Amine nitrogen
- Carbonyl oxygen
- Carbonyl carbon
- Chlorine atom
-
What is the mass of ethylamine (C2H7N, Mr 45) formed from 0.1 mol of bromoethane with excess ammonia?
- 4.5 g
- 45 g
- 2.25 g
- 9.0 g
-
Which organic product forms alongside a carboxylic acid when a primary amine reacts with an acid anhydride?
- Ester
- Quaternary ammonium salt
- Secondary alcohol
- N-substituted amide
-
What organic product is formed when a primary amine reacts with an acyl chloride?
- Ester
- N-substituted amide
- Nitrile
- Primary amine
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