Class 12 Haloalkanes and Haloarenes MCQs with Answer

Class 12 Chemistry Haloalkanes and Haloarenes MCQs with Answer

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Q3. In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

Assertion and reason both are correct statements and reason is correct explanation for assertion.
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
Assertion is correct statement but reason is wrong statement.
Assertion is wrong statement but reason is correct statement.

Assertion: Lower members of alkyl halides are colourless gases.
Reason: Alkyl iodides in general turn black on exposure to air and light.

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Ans: 3. Assertion is correct statement but reason is wrong statement.

Explanation:
Alkyl iodides in general turn brown due to liberation of I on decomposition by the action of air and light.

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Ans: 1. Intermediate (c) is unstable because in this carbon is attached to 5 atoms.

Intermediate (c) is less stable than the reactant (b).
Explanation:
In the given reaction intermediate (c) is unstable because the carbon atom is attached to 5 atoms and is less stable than reactant (b).

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Ans: 4. (a) < (b) < (c)

Explanation:

Electron withdrawing group increase the reactivity of aryl halides, more is the number of electron withdrawing group,the more is rate towards nucleophilic substitution.