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STD 12 - 8.2 Carboxylic acids and their derivative — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 8.2 Carboxylic acids and their derivative4 Marks
MCQ
Different possible thermal decomposition pathways for peroxyesters are shwon below. Match each pathway from List-$I$ with an appropriate structure from List-$II$ and select the correct answer using the code given below the lists. $Image$

Codes: $ \quad P \quad Q \quad R \quad S $

  • ✓
    $\quad 1 \quad 3 \quad 4 \quad 2 $
  • B
    $\quad 2 \quad 4 \quad 3 \quad 1 $
  • C
    $\quad 4 \quad 1 \quad 2 \quad 3 $
  • D
    $\quad 3 \quad 2 \quad 1 \quad 4 $
✓

Answer

Correct option: A.
$\quad 1 \quad 3 \quad 4 \quad 2 $
a
This is an excellent question, probably the best in the paper. Pyrolysis of peroxyesters is not conventionally taught anywhere for $IIT$-$JEE$ preparation, not even in any standard organic chemistry course. But the question is throughly logical. It can be answered after a bit of reflection by anyone with good basics of reaction mechanism.

Four pathways for reactions are given :

$Image$

with $3 \& 4$, but not with $1 \& 2$.

$\therefore \quad 1: P$ or $S \quad 3: Q$ or $R$

$2$: $P$ or $S \quad 4: Q$ or $R$

combining these options gives

$1$: $P$ , $2$: $S$ , $3$: $Q$ , $4$: $R$

I cannot but help commenting that such questions are those which make $IIT-JEE$ what it is. A good motivation for students to keep thinking while studying .

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