Benzene and Alkyl Benzene - Result Question 8
12. Match the four starting materials given in Column I with the corresponding reaction schemes provided in Column II and select the correct answer using the code given below the lists.
Codes
| A | B | C | D | |
|---|---|---|---|---|
| (a) | p | s | q | r |
| (b) | r | p | s | q |
| (c) | r | s | q | p |
| (d) | s | p | r | q |
(2014 Adv.)
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Answer:
Correct Answer: 12. (c)
Solution:
PLAN: This problem can be solved by using the various concepts synthesis of benzene, electrophilic substitution reaction and directive influence of various substituents, including oxidation and reduction.
$\Rightarrow-OH$ and $-NH _2$ are $o / p$-directing groups.
$\Rightarrow N$-acetylation is more favourable than $C$-acylation.
$\Rightarrow N$-sulphonation is more favourable than $C$-sulphonation.
$\Rightarrow NO _2$ is a meta-directing group.
$\Rightarrow H _2 S \cdot NH _3$ reduces only one $NO _2$ group selectively in the presence of two $NO _2$ groups.
Using above concepts the correct sequence of reaction can be written as
Above reaction proceeds through oxidation, chlorination and amide formation sequentially.
$\therefore A \rightarrow r, B \rightarrow s, C \rightarrow q, D \rightarrow p$
Hence, the correct choice is (c).
BETA
