Verified Solution • 2025–26 Session moderate

QJEEM24Chce15: JEE Main 2024 Chemistry - Class 12 JEEM24Chce15 Solution: Given below are two statements : one is labelled as Assertion…

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Haloalkanes react with KCN to form alkyl cyanides as a main product while with AgCN\mathrm{AgCN} form isocyanide as the main product.

Reason (R) : KCN\mathrm{KCN} and AgCN\mathrm{AgCN} both are highly ionic compounds.

In the light of the above statements, choose the most appropriate answer from the options given below :

Multiple Choice Options

  • A Both (A) and (R) are correct and (R) is the correct explanation of (A)
  • B (A) is not correct but (R) is correct
  • C Both (A) and (R) are correct but (R) is not the correct explanation of (A)
  • D (A) is correct but (R)(\mathbf{R}) is not correct

Step-by-Step Verified Solution

amp;R−X+KCN⟶R−CN+KXamp;R−X+AgCN⟶R−NC+AgX\begin{aligned} & \mathrm{R}-\mathrm{X}+\mathrm{KCN} \longrightarrow \mathrm{R}-\mathrm{CN}+\mathrm{KX} \\\\ & \mathrm{R}-\mathrm{X}+\mathrm{AgCN} \longrightarrow \mathrm{R}-\mathrm{NC}+\mathrm{AgX}\end{aligned}

KCN\mathrm{KCN} is ionic so it provides cyanide ions in solution and attacks from carbon side on alkyl halide.

But AgCN\mathrm{AgCN} is covalent it cannot form cyanide ion so it attacks from nitrogen side and isocyanide is formed predominantly.

A\mathrm{A} is correct R\mathrm{R} is not correct.

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