Which of the following statements is/are correct? 1. CH3 CHCl CH3 is a secondary alkyl halide. 2

step 1 Which of the following statements are correct? There are 4 statements given and there are 4 poss

Which of the following statements is/are correct? 1. CH3...

Which of the following statements is/are correct? 1. $\mathrm{CH}_{3} \mathrm{CHCl} \mathrm{CH}_{3}$ is a secondary alkyl halide. 2. Acetylene is formed when $\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{Cl}$ is heated with water. 3. Iodoform gives a precipitate with $\mathrm{AgNO}_{3}$ solution on heating, whereas chloroform does not. 4. Freon $\left(\mathrm{CCl}_{2} \mathrm{~F}_{2}\right)$ is prepared by the action of $\mathrm{CCl}_{4}$ and $\mathrm{SbF}_{3}$ in the presence of $\mathrm{SbCl}_{5}$ as a catalyst. (a) 1,2 and 3 (b) 2,3 and 4 (c) 1,3 and 4 (d) 3 and 4

Which of the following statements is/are correct?
1. $\mathrm{CH}_{3} \mathrm{CHCl} \mathrm{CH}_{3}$ is a secondary alkyl halide.
2. Acetylene is formed when $\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{Cl}$ is heated with water.
3. Iodoform gives a precipitate with $\mathrm{AgNO}_{3}$ solution on heating, whereas chloroform does not.
4. Freon $\left(\mathrm{CCl}_{2} \mathrm{~F}_{2}\right)$ is prepared by the action of $\mathrm{CCl}_{4}$ and $\mathrm{SbF}_{3}$ in the presence of $\mathrm{SbCl}_{5}$ as a catalyst.
(a) 1,2 and 3
(b) 2,3 and 4
(c) 1,3 and 4
(d) 3 and 4

Key Concepts

Alkyl Halide Classification

Alkyl halides are classified based on the nature of the carbon bearing the halogen. A primary alkyl halide has the halogen attached to a carbon connected to only one other carbon, a secondary to a carbon connected to two other carbons, and a tertiary to one connected to three other carbons. This classification affects their reactivity in nucleophilic substitution and elimination reactions.

Reactivity of Vinyl Halides

Vinyl halides are compounds where the halogen is attached to an sp²-hybridized carbon of a double bond. This positioning renders them less reactive in many substitution and addition reactions due to the partial double bond character and electron density of the carbon–halogen bond. Their chemistry differs markedly from that of alkyl halides, leading to distinct reaction pathways.

Silver Halide Precipitation Reaction

The reaction of haloforms with silver nitrate is a classical qualitative test based on the formation of an insoluble silver halide precipitate. The differing solubilities of silver halides (e.g., silver iodide precipitates readily compared to silver chloride) can be used to distinguish between haloforms of different halogens, reflecting the relative reactivity of carbon–halogen bonds.

Halogen Exchange Reactions in Organic Synthesis

Halogen exchange reactions, often facilitated by metal catalysts, involve the replacement of one halogen atom in an organic compound by another. These reactions are common in the synthesis of specific organohalogen compounds, such as certain refrigerants, where precise substitution is required. The choice of catalyst and reaction conditions is critical to driving the exchange selectively.

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