Question:
Which of the following compound will have highest boiling point?
Which of the following compound will have highest boiling point?
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Boiling point trend for alkyl halides: RI $>$ RBr $>$ RCl $>$ RF.
Updated On: Apr 24, 2026
- CH\(_3\)F
- CH\(_3\)CH\(_2\)F
- CH\(_3\)Cl
- CH\(_3\)I
- CH\(_3\)Br
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
For similar molecules (alkyl halides), the boiling point increases with an increase in molecular weight and the size of the halogen atom due to stronger London dispersion forces.
Step 2: Detailed Explanation:
Among the given halomethanes, CH3I has the largest and most polarizable iodine atom. This leads to the strongest London dispersion forces between its molecules. CH3F, CH3Cl, and CH3Br are smaller and have weaker intermolecular forces. CH3CH2F (ethyl fluoride) has a higher molecular weight than CH3F but lower than CH3I. Iodine is much larger and heavier than fluorine, chlorine, or bromine, so CH3I will have the highest boiling point.
Step 3: Final Answer:
CH3I has the highest boiling point.
For similar molecules (alkyl halides), the boiling point increases with an increase in molecular weight and the size of the halogen atom due to stronger London dispersion forces.
Step 2: Detailed Explanation:
Among the given halomethanes, CH3I has the largest and most polarizable iodine atom. This leads to the strongest London dispersion forces between its molecules. CH3F, CH3Cl, and CH3Br are smaller and have weaker intermolecular forces. CH3CH2F (ethyl fluoride) has a higher molecular weight than CH3F but lower than CH3I. Iodine is much larger and heavier than fluorine, chlorine, or bromine, so CH3I will have the highest boiling point.
Step 3: Final Answer:
CH3I has the highest boiling point.
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