Which substance has the lowest boiling point?

C H_{3} C H_{2} C H_{2} C H_{2} O C H_{3}

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C H_{3} C H_{2} O C H_{2} C H_{3}

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C H_{3} C H_{2} C H_{2} C H_{3}

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C H_{3} C H_{2} C = O C H_{3}

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Solution

The correct option is D $C H_{3} C H_{2} C H_{2} C H_{3}$
$C H_{3} C H_{2} C H_{2} C H_{3}$ $(n - b u t a n e)$ has the lowest boiling point as it has lowest molecular weight and is non polar. It has weakest intramolecular forces of attraction.
All others are polar comp[ounds and so has dipole-dipole inbteraction.

Hence, the correct option is $C$

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