A Level Chemistry 2017 Paper 1 Question 27 Solution - Exclusive
In this exclusive video we want to discuss the suggested solution for A Levels Chemistry (H2 Chemistry) 2017 Paper 1 Question 27.
Let's take a look at this question:
The topic tested in this question is on SN1 Mechanism of Halogenoalkane.
Since the solvent has to be polar, we can immediately eliminate option B since C6H14 is non-polar.
From the second step of the mechanism, OH- from NaOH acts as a nucleophile and attack the carbocation to form an alcohol product.
A by-product can be formed in the second step when the polar solvent acts as a competing nucleophile to attack the carbocation.
Hence we need to consider the nucleophilic attack for each polar solvent and determine if a by-product is formed.
A. H2O solvent
On nucleophilic attack of H2O and subsequent deprotonation, the product formed is an alcohol which is the same product formed from NaOH.
Therefore there are no by-products and option A is the most likely answer.
C. CH3CH2NH2 solvent
On nucleophilic attack of amine CH3CH2NH2 and subsequent deprotonation, produced formed is a secondary amine.
A different by-product is formed.
D. CH3CH2OH solvent
On nucleophilic attack of alcohol CH3CH2OH and subsequent deprotonation, produced formed is an ether.
A different by-product is also formed.
Finally we can compare the options and confirm the answer to this question is option A.
Check out this video for the full solution and detailed explanation!
Topic: Halogenoalkanes, Organic Chemistry, A Level Chemistry, Singapore
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