Assertion :Alkyl halides are colourless when pure. Reason: Bromides and Iodides develop colour when exposed to light.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Purealkyl halides are colorless. Bromides and iodides have lower bond dissociation energy as compared to fluoride and iodide which break down them into ions. This low enthalpy means that even at normal temperature or on exposure to sunlight, iodides and bromides decompose and form free iodine and bromine, both of which are colored and hence impart color to the original halides.

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