TS EAMCET · Chemistry · Hydrocarbons

In which of the following reactions, \(t\)-butyl benzene is formed 1. Benzene \(+t\)-butyl chloride \(\stackrel{\mathrm{AlCl}_3}{\longrightarrow}\) 2. Benzene \(+\left(\mathrm{CH}_3\right)_2 \mathrm{C}=\mathrm{CH}_2 \stackrel{\mathrm{BF}_3}{\stackrel{\mathrm{HF}}{\longrightarrow}}\) 3. Benzene \(+t\)-butyl alcohol \(\stackrel{\mathrm{H}_2 \mathrm{SO}_4}{\longrightarrow}\) 4. Benzene + butanoyl chloride \(\underset{\mathrm{Zn} / \mathrm{HCl}}{\stackrel{\mathrm{AlCl}_3}{\longrightarrow}}\)

A 1, 2 and 3
B 2, 3 and 4
C 1, 2 and 4
D 1, 3 and 4

Verified Solution

Answer & Solution

Correct Answer

(A) 1, 2 and 3

Step-by-step Solution

Detailed explanation

The given reactions take place as follows. 1. The replacement of H-atom in benzene, by alkyl group can be brought about alkyl chloride in presence of anhydrous \(\mathrm{AlCl}_3\). Reaction is known as Friedel-Craft's alkylation reaction. 2. In this reaction, benzene reacts to 2…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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Expt	$\frac{- d [NO]}{dt}$ ${molL}^{- 1} s^{- 1}$	$[NO]$ ${molL}^{- 1}$	$[H_{2}]$ ${molL}^{- 1}$
$1$ .	$4.8 \times 10^{- 5}$	$1 \times 10^{- 2}$	$1 \times 10^{- 3}$
$2$ .	$43.2 \times 10^{- 5}$	$3 \times 10^{- 2}$	$1 \times 10^{- 3}$
$3$ .	$86.4 \times 10^{- 5}$	$3 \times 10^{- 2}$	$2 \times 10^{- 3}$