Haloarenes and the stability of the C-X bond — NEET & JEE Questions

Question 1 · difficulty L1 · recall

In chlorobenzene, the carbon bonded to chlorine is

• A. sp2-hybridised
• B. sp3-hybridised
• C. sp-hybridised
• D. unhybridised

Question 2 · difficulty L2 · understanding

In the presence of sunlight, benzene reacts with Cl 2 to give product, X. The number of hydrogens in X is _____________.

Question 3 · difficulty L2 · understanding

Consider the above reaction. The number of $$\pi$$ electrons present in the product 'P' is __________.

Question 4 · difficulty L2 · understanding

$$\text { Match the LIST-I with LIST-II }$$ $$\begin{gathered} \text { List-I } \\ \text { Name of reaction } \end{gathered}$$ $$\begin{gathered} \text { List-II } \\ \text { Reagent or catalyst used } \end{gathered}$$ A. Finkelstein reaction I. $\mathrm{SbF}_3$ B. Swarts reaction II. Na, dry ether C. Sandmeyer's reaction III. NaI D. Fittig reaction IV. $\mathrm{Cu}_2 \mathrm{Cl}_2$ Choose the correct answer from the options given below :

• A. A-I, B-IV, C-III, D-III
• B. A-III, B-I, C-IV, D-II
• C. A-IV, B-II, C-I, D-III
• D. A-I, B-III, C-II D-IV

Question 5 · difficulty L2 · understanding

$$\text { Consider the following compounds }$$ $$\text { Arrange these compounds in the increasing order of reactivity with nitrating mixture. }$$

• A. $c < b < a$
• B. $\mathrm{b}<\mathrm{c}<\mathrm{a}$
• C. $\mathrm{c}<\mathrm{a}<\mathrm{b}$
• D. $\mathrm{b}<\mathrm{a}<\mathrm{c}$

Question 6 · difficulty L2 · understanding

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R : Assertion A : Aryl halides cannot be prepared by replacement of hydroxyl group of phenol by halogen atom. Reason R : Phenols react with halogen acids violently. In the light of the above statements, choose the most appropriate from the options given below :

• A. A is true but R is false
• B. Both A and R are true but R is NOT the correct explanation of A
• C. A is false but R is true
• D. Both A and R are true and R is the correct explanation of A

Question 7 · difficulty L2 · understanding

In the following halogenated organic compounds, the one with the maximum number of chlorine atoms in its structure is :

• A. Gammaxene
• B. Chloropicrin
• C. Chloral
• D. Freon-12

Question 8 · difficulty L2 · understanding

Match List I with List II List I List II A. I. Fittig reaction B. II. Wurtz Fittig reaction C. III. Finkelstein reaction D. $$\mathrm{C_5H_5C1+NaI\to C_2H_5I+NaCl}$$ IV. Sandemyer reaction Choose the correct answer from the options given below :

• A. A - IV, B - II, C - III, D - I
• B. A - II, B - I, C - IV, D - III
• C. A - II, B - I, C - III, D - IV
• D. A - III, B - II, C - IV, D - I

Question 9 · difficulty L2 · understanding

The given reaction can occur in the presence of : (a) Bromine water (b) Br 2 in CS 2 , 273 K (c) Br 2 /FeBr 3 (d) Br 2 in CHCl 3 , 273 K Choose the correct answer from the options gien below :

• A. (b) and (d) only
• B. (a) and (c) only
• C. (b), (c) and (d) only
• D. (a), (b) and (d) only

Question 10 · difficulty L2 · understanding

The above reaction requires which of the following reaction conditions?

• A. 623 K, Cu, 300 atm
• B. 623 K, 300 atm
• C. 573 K, 300 atm
• D. 573 K, Cu, 300 atm