The melting point of p-dichlorobenzene is higher than that of its ortho- and meta-isomers due to its highly symmetrical structure. This symmetry allows the molecules to pack more efficiently and tightly in the crystal lattice, forming a more stable and orderly solid. As a result, stronger intermolecular forces hold the molecules together, and more energy (heat) is required to break these interactions during melting. In contrast, the less symmetrical o- and m-isomers pack less efficiently, have weaker intermolecular forces, and thus melt at lower temperatures.
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प्रश्न
p-Dichlorobenzene has higher m.p. and lower solubility than those of o- and m-isomers. Discuss.
Why p-dichlorobenzene has higher melting point than those of ortho and meta-isomers?
p-Dichlorobenzene has higher m.p. than those of o- and m-isomers. Discuss.
Why is the melting point of p-dichlorobenzene higher than that of o- and m-isomers?
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अध्याय 6: Haloalkanes and Haloarenes - Exercises [पृष्ठ १९०]
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संबंधित प्रश्न
Give reasons : n-Butyl bromide has higher boiling point than t-butyl bromide.
Why dextro and laevorotatory isomers of Butan-2-ol are difficult to separate by fractional distillation?
Which of the following halide is 2°?
The decreasing order of boiling points of alkyl halides is:
Which of the following is liquid at room temperature (b.p. is shown against it)?
p-dichlorobenzene has a higher melting point than its o- and m-isomers because ____________.
Arrange the following compounds in increasing order of their boiling points.
(a) \[\begin{array}{cc}
\ce{CH3}\phantom{..................}\\
\backslash\phantom{...........}\\
\ce{CH - CH - CH2Br}\\
/\phantom{.............}\\
\ce{CH3}\phantom{..................}
\end{array}\]
(b) \[\ce{CH3CH2CH2CH2Br}\]
(c) \[\begin{array}{cc}
\phantom{...}\ce{CH3}\\
\phantom{}|\\
\ce{H3C - C - CH3}\\
\phantom{}|\\
\phantom{..}\ce{Br}
\end{array}\]
Assertion: The boiling points of alkyl halides decrease in the order:
RI > RBr > RCl > RF
Reason: The boiling points of alkyl chlorides, bromides and iodides are considerably higher than that of the hydrocarbon of comparable molecular mass.
Arrange the following compounds in increasing order of their boiling points:
CH3CH2OH, CH3−CHO, CH3−COOH
Why alkyl halides though polar are immiscible with water?
Arrange the isomeric dichlorobenzene in the increasing order of their boiling point and melting points.
Write the structure of the following organic halogen compound.
1,4-Dibromobut-2-ene
Write the structure of the following organic halogen compound.
4-tert-Butyl-3-iodoheptane
Write the structure of the following organic halogen compound.
4-tert-Butyl-3-iodoheptane
Write the structure of the following organic halogen compound.
4-tert-Butyl-3-iodoheptane
Write the structure of the following organic halogen compound:
4-tert-Butyl-3-iodoheptane
Name the following halides according to the IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halide:
\[\ce{CH3 C(C2H5)2CH2Br}\]
