Which one of the following has the minimum bo | vedclass

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(D) The boiling point of hydrocarbons depends on molecular weight,molecular shape,and branching.
For isomers,the boiling point decreases as the degre

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Isobutane

Vedclass · Answer

(D) The boiling point of hydrocarbons depends on molecular weight,molecular shape,and branching.
For isomers,the boiling point decreases as the degree of branching increases because the surface area decreases,leading to weaker van der Waals forces.
Comparing the given compounds: $1-$Butene $(C_4H_8)$,$1-$Butyne $(C_4H_6)$,$n-$Butane $(C_4H_{10})$,and Isobutane $(C_4H_{10})$.
Isobutane ($2-$methylpropane) is a branched isomer of $n-$butane.
Among the alkanes,branched isomers have lower boiling points than straight-chain isomers.
Comparing the boiling points: $n-$Butane $(\approx 272.5 \ K) > 	ext{Isobutane} (\approx 261.4 \ K)$.
$1-$Butyne and $1-$Butene have higher boiling points due to the presence of $\pi$ bonds and higher molecular polarity compared to alkanes.
Therefore,Isobutane has the minimum boiling point among the given options.

Which one of the following has the minimum boiling point?

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