Consider the following statement about physical properties of alkyl halides: I. Lower alkyl halides CH3CI, C2H5Cl and CH3F are gases at room temperature. II. Alkyl halides upto C18 are colorless liquids. III. Those beyond C18 are colourless solids. IV. They are usually insoluble in water due to their inability to form hydrogen bonding with water. Which of the above statement is/are correct?
Correct answer: D. I, II, III and IV
- A. I only
- B. lI only
- C. Ill and IV only
- D. I, II, III and IV
Explanation
The correct answer is: D. I, II, III, and IV Explanation: I. Lower alkyl halides like CH3Cl, C2H5Cl, and CH3F are indeed gases at room temperature. II. Alkyl halides up to C18 are generally colorless liquids. III. Those beyond C18 are typically colorless solids. IV. Alkyl halides are usually insoluble in water because they cannot form hydrogen bonds with water molecules. The lack of hydrogen bonding makes it challenging for them to dissolve in polar solvents like water.
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About Alkyl Halides
Alkyl halides are named and related to their carbon-halogen structure, polarity and reactivity. The key reactions are nucleophilic substitution by SN1 and SN2 mechanisms and elimination by E1 and E2 mechanisms, including how substrate structure, nucleophile, base, solvent and temperature influence substitution versus elimination.
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