AIIMS 2019 Chemistry Hydrolysis of Halides Assertion Reason Question
Assertion: SiCl₄ gets easily hydrolysed, while CCl₄ does not. Reason: Carbon cannot extend its covalency due to the absence of d-orbitals, but Si can extend its covalency.
If both assertion and reason are true and reason is correct explanation of assertion.
If both assertion and reason are true and reason is not correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
SiCl₄ readily undergoes hydrolysis to form SiO₂ and HCl when reacted with H₂O, while CCl₄ remains stable in water due to the lack of hydrolyzable bonds. This difference arises because silicon can expand its valence shell to accommodate additional bonds, allowing it to interact with water, whereas carbon cannot extend its covalency due to the absence of d-orbitals. Therefore, both the assertion and reason are true, and the reason correctly explains why SiCl₄ hydrolyzes while CCl₄ does not, making option A correct. Other options are incorrect because they either misrepresent the truth of the assertion or the reason, or fail to establish the correct relationship between them.
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