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Among CH_3CH_2CH_2CH_2Cl, CH_3 -underset(Cl)underset(|)CH - CH_2 - CH_3, (CH_3)_3 C - Cl. Which one has low boling point ? Give reason. |
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Answer» Solution :For a compound with MOLECULAR formula `C_5H_9Cl_3` isomers `(1^@, 2^@, 3^@)` are possible. AMONG the isomeric alkyl halides, the boiling point decreases with the increase in branching in the alkyl chain. This is because with increase in branching, the MOLECULE attains spherical shape with less surface area. As a result, the intermolecular forces become weak, resulting in LOWER boiling point. Therefore the boiling point decreases in the order: `underset(351.5 K)(CH_3-CH_2 - CH_2)-CH_2Cl gt underset((341 K))(CH_3-underset(Cl)underset(|)CH-CH_3) - CH_3 gt underset((324K))(CH_3 - underset(Cl)underset(|)overset(CH_3)overset(|)C-CH_3)` Hence, `(CH_3)_3C -Cl`has the lowest boiling point. |
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