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WorksheetsSN1 reactions
Total questions: 12
Worksheet time: 6mins
In SN1 reaction, racemisation occurs if the reaction occurs at a stereogenic centre, however, 50:50 mixture of enantiomers are rarely obtained, why?
Usually one enantiomer is more stable than other
Retention of configuration is always favoured in reaction
Hydroxylic solvent favour retention of configuration
There is steric hindrance to the approach of nucleophile from the front side as some of the leaving group are not departed completely which favour inversion of configuration
Pick out the most reactive alkyl halide for an SN1 reaction.
Pick out the compound which reacts fastest in the presence of AgNO3.
(CH3)3CCI
(CH3)2CHCH2CI
(CH3)2CHCI
CH3CH2CI
From the following, pick out the explanation for why molecule Y hydrolyses faster than molecule Z.
Less steric hindrance
Neighbouring group participation
Greater carbocation stability
Better solvent
Which of the following statement(s) is/are true for SN1 reaction?
I. The rate of SN1 reaction depends on concentration of alkyl halide
II. The rate of SN1 reaction depends on concentration of nucleophile
III. SN1 reactions of alkyl halides are favoured by non-polar solvents
Only I
Only II
Only III
Both I and III
From the following, pick out the potential energy profile for a SN1 reaction.
The most and least reactive electrophiles respectively in a SN1 reaction are
I and II respectively
II and III respectively
I and III respectively
III and IV respectively
Pick out the following factor(s) which promote a SN1 reaction :
I. Temperature
II. Concentration of nucleophile
III. Concentration of alkyl halide
IV. Aprotic solvents
Both I and II
Both II and III
Both III and IV
Both I and III
Which of the following is true regarding a SN1 reaction?
It would be faster at 25°C than at 50°C
it would be faster in ethanol than in pentane
Keeping the moles of reactants constant but doubling the quantity of solvent would decrease the rate by a factor of 4
Stereochemical inversion occurs exclusively
Rank the following molecules increasing in order of relative rate of SN1 solvolysis with methanol and heat.
Ill < II < IV < V < I
II < III < IV < I < V
V < IV < III < II < I
II < III < IV < V < I
Which is the most likely product when the following iodide is heated with water?
When the reactants shown undergo substitution, which of the products will form?
This question has four choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.
