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Introduction to E2 Mechanism

Which of the ...

Question

Which of the following reaction is not exothermic?

C H_{3} - C l + C H_{3} - C H_{3} \to C H_{4} + C H_{3} - C H_{2} - C l

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C H_{3} - C l + (C H_{3})_{3} - C - H \to C H_{4} + (C H_{3})_{3} C - C l

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C H_{3} - C l + C H_{2} = C H - C H_{3} \to C H_{4} + C H_{2} = C H - C H_{2} - C l

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C H_{3} - C l + C H_{2} = C H_{2} \to C H_{4} + C H_{2} = C H C l

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Solution

The correct option is D $C H_{3} - C l + C H_{2} = C H_{2} \to C H_{4} + C H_{2} = C H C l$
An exothermic reaction is a chemical reaction that releases energy through light or heat. The enthalpy change for such reactions is usually negative.

$C H_{3} - C l + C H_{2} = C H_{2} ⟶ C H_{4} + C H_{2} = C H - C l$

This reaction is not an exothermic reaction as it involves reaction of an alkene to chloromethyl which leads to formation of methane.

Because vinyl radical is unstable ( $C H_{2} = C H^{\cdot}$ )

No energy is released during this reaction.

Option D is correct.

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Similar questions

S_{N} 2

c o n c . H C l :

(a) C H_{3} - C H_{2} - O H A n h y Z n C l_{2} / △ - -------- \to C H_{3} - C H_{2} - C l

(b) C H_{3} - C H_{3} | C | C H_{3} - C H_{2} O H A n h y Z n C l_{2} / △ - -------- \to C H_{3} - C H_{1} | C | C H_{3} - C H_{2} - C H_{3}

(c) C H_{3} - O H | C | C H_{3} - C H_{3} A n h y Z n C l_{2} / △ - -------- \to C H_{3} - C l | C | C H_{3} - C H_{3}

(d) C H_{2} = C H - C H_{2} - O H A n h y Z n C l_{2} / △ - -------- \to C H_{2} = C H - C H_{2} - C l

\begin{matrix} C H_{3} - & C H & - C H_{2} - C l | C H_{3} \end{matrix}

\begin{matrix} C H_{3} - C H_{2} - & C H & - C l | C H_{3} \end{matrix}

S_{N} 1

S_{N} 2

C H_{3} - C l

C H_{3} - C | | O - C H_{2} - C l

C H_{3} - C H | C H_{3} - C H_{3} - C l

C H_{3} - C H_{2} - C l

C l - C H_{2} - C H_{3} | C | C H_{3} - C H_{2} - C H_{2} - C l + I^{-} - -- \to D M F

A . C H_{3} - C H = C H_{2} + H C l ⟶ C H_{3} - C | C l H - C H_{3}

B . C H_{3} - C H = C H_{2} + H B r ⟶ C H_{3} - C H_{2} - C H_{2} B r

C . C H_{3} - C H = C H_{2} + H B r p e r o x i d e - ---- \to C H_{3} - C H_{2} - C H_{2} - B r

D . C H_{3} - C H = C H_{2} + H I p e r o x i d e - ---- \to C H_{3} - C | I H - C H_{3}

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