Question:
: $p$-dichlorobenzene is less soluble in organic solvents than the corresponding $o$-isomer.
: $o$-dichlorobenzene is polar while $p$-dichlorobenzene is not
: $p$-dichlorobenzene is less soluble in organic solvents than the corresponding $o$-isomer.
: $o$-dichlorobenzene is polar while $p$-dichlorobenzene is not
Updated On: Jul 28, 2022
- If both Assertion: and Reason: are true and the Reason: is the correct explanation of the Assertion
- If both Assertion: and Reason: are true but the Reason: is not the correct explanation of the Assertion
- If Assertion: is true but Reason: is false
- If both Assertion: and Reason: are false
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The Correct Option is B
Solution and Explanation
$p$-dichlorobenzene is more symmetrical than o-isomer, so fits closely in the crystal lattice and hence, greater amount of energy is needed to break the crystal lattice. Thus $p$-isomer is less soluble than o-isomer.
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Concepts Used:
Properties of Benzene
Physical Properties:
- Benzene is a colorless liquid with a distinct odor.
- It's highly flammable and volatile.
- It is soluble in organic solvents while insoluble in water.
- Its boiling point is 80.5°C.
- It shows resonance.
Chemical Properties:
- Nitration: Nitration involves the reaction when benzene is reacted with nitric acid in the presence of sulphuric acid. The temperature then remains at 55°C and it results in the formation of nitrobenzene.
- Sulphonation: Benzene reacts with fuming sulphuric acid and results in the formation of benzene sulfonic acid in sulphonation reactions.
- Halogenation: Benzene reacts with halogen in the presence of the Lewis acid resulting in the formation of aryl halide. This reaction is known as halogenation.
- Friedel Crafts Acylation reaction: During the reaction of the benzene with an acyl halide, in presence of Lewis acid, it results in the formation of acyl benzene. This is called Friedel craft’s acylation reaction.
- Friedel Crafts Alkylation reaction: During the reaction of the benzene with an alkyl halide, in presence of Lewis acid like anhydrous Aluminium Chloride, alkyl benzene is formed. This is called Friedel craft’s alkylation reaction.