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Sourav posted an Question

August 15, 2020 • 08:14 am

30 points

IIT JAM
Chemistry (CY)

***** arrange following in decreasing 'a' factor (hĻo, co, ar) (1) h0, co, ar (2) he, ne, ar, kr 54. (3) n-pentane, isopentane, neopentane

***** Arrange following in decreasing 'a' factor (HĻO, CO, Ar) (1) H0, CO, Ar (2) He, Ne, Ar, Kr 54. (3) n-pentane, isopentane, neopentane

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Ashutosh singh

The 'a' value of gas is directly proportional to the attraction between the gas molecules and is also directly proportional to the ease with which a gas can be liquefied. The dipole-dipole interactions are stronger than London or induced dipole interactions. 😊
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Ashutosh singh

The a values of gas is directly proportional to the intermolecular forces of attraction...and the 'a' value is directly proportional to the ease with which the gas can be liquefied. 😊
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Priyanshu kumar Best Answer

For 2 it becomes Kr>Ar>Ne>He
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As london forces increases as the number of electrons increases
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For 1 it becomes H20>Co2>Ar
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For bit 1 and 2 check the strength of forces sourav
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in all noble gases london forces is there which increases with increase in no of electron
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got sourav??
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what about option 1?
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plz explain how to arrange bit 1
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in h20 dipole dipole interactions and extensive H bonding
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CO2 is non polar type so london dispersion forces
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so H20 has more a value than Co2
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what about co2 and Ar
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there is polar nature in CO bonds but overall is non polar molecule and strength of london dispersion force is more than Ar
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london forces increases with number of electrons also
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now got it sourav??
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co2 has 22 e and Ar has 20..so london disp Force of co2 is more.
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Ar 18 na
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so sorry
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Priyanshu kumar

For 3 its is n pentane>isopentane>neopentane
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check for intermolecular forces of attraction
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can we say that greater is the molecular weight and surface area, greater will be value of a?
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yes straight and branching hydrocarbon
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what about molecular wt.. is it also valid?
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here molecular weight same na...in isomers of pentane
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not im asking about other options like bit 1 and 2
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