Assertion: Phenol forms 2,4,6–tribromophenol on treatment with \(Br_2\) in carbon disulphide at 273K. Reason: Bromine and carbon disulphide both are nonpolar. (a) Both assertion and reason are true and the reason is the correct explanation of assertion. (b) Both assertion and reason are true but the reason is not the correct explanation of assertion. (c) Assertion is true but reason is false. (d) Assertion is false but reason is true.

Assertion: Phenols give o- and p-nitrophenol on nitration with conc. \(HNO_3\) and \(H_2\)\(SO_4\) mixture. Reason: —OH group in phenol is o–, p– directing. (a) Both assertion and reason are true and the reason is the correct explanation of assertion. (b) Both assertion and reason are true but the reason is not the correct explanation of assertion. (c) Assertion is true but reason is false. (d) Assertion is false but reason is true.

Read the passage given below and answer the following questions: The polarity of carbon-halogen bond of alkyl halides is responsible for their Nucleophilic substitution, elimination and their reaction with metal atoms to form organ metallic compounds. Nucleophilic substitution reactions are categorized into SN1 and SN2 on the basis of their kinetic properties. Chirality has a profound role in understanding the reaction mechanisms of SN1 and SN2 reactions. SN2 reactions of chiral alkyl halides are characterized by the inversion of configuration while SN1 reactions are characterized by racemisation. ASSERTION -REASON TYPE A statement of assertion is followed by a statement of reason. Mark the correct choice from the options given below: (a) Both assertion and reason are true and reason is the correct explanation of assertion. (b) Both assertion and reason are true but reason is not the correct explanation of assertion. (c) Assertion is true but reason is false. (d) Assertion is false but reason is true. (i) Assertion : SN2 reactions do not proceed with retention of configuration. Reason : SN2 reactions proceed in a single step. (ii) Assertion : Tertiary alkyl halides show high reactivity in SN1 reaction. Reason : Tertiary carbocation has more stability. (iii) Assertion : Nucleophilic substitution reaction in an optically active alkyl halide gives a mixture of enantiomers. Reason : Reaction occurs by SN1 mechanism. (iv) Assertion : Primary allylic halides show higher reactivity in SN1 reactions than other primary alkyl halides. Reason : Intermediate carbocation is stabilized by resonance.

Assertion :- Interhalogen compounds are more reactive than halogen. Reason :- They all undergo hydrolysis giving halide, cation derived from the smaller halogen & anion derived from larger halogen. a) Assertion and reason both are correct statements and reason is correct explanation for assertion. b) Assertion and reason both are correct statements but reason is not correct explanation for assertion. c) Assertion is correct statement but reason is wrong statement. d) Assertion is wrong statement but reason is correct statement.

Assertion :- \(O_3\) acts as a powerful oxidising agent. Reason :- \(O_3\) oxidises lead sulphide to lead sulphate & iodide ions to iodine a) Assertion and reason both are correct statements and reason is correct explanation for assertion. b) Assertion and reason both are correct statements but reason is not correct explanation for assertion. c) Assertion is correct statement but reason is wrong statement. d) Assertion is wrong statement but reason is correct statement.

Assertion :-Solubility of noble gases in water decreases with increasing size of the noble gases. Reason :- Solubility of noble gases in water is due to dipole- dipole interaction. a) Assertion and reason both are correct statements and reason is correct explanation for assertion. b) Assertion and reason both are correct statements but reason is not correct explanation for assertion. c) Assertion is correct statement but reason is wrong statement. d) Assertion is wrong statement but reason is correct statement.

Assertion :-Water has high melting point. Reason :- Water molecules are associated with hydrogen bonding. a) Assertion and reason both are correct statements and reason is correct explanation for assertion. b) Assertion and reason both are correct statements but reason is not correct explanation for assertion. c) Assertion is correct statement but reason is wrong statement. d) Assertion is wrong statement but reason is correct statement.

Assertion:-Ammonia gas is highly soluble in water. Reason:-Its aqueous solution is weakly acidic. a) Assertion and reason both are correct statements and reason is correct explanation for assertion. b) Assertion and reason both are correct statements but reason is not correct explanation for assertion. c) Assertion is correct statement but reason is wrong statement. d) Assertion is wrong statement but reason is correct statement.

Assertion : -The bond between F-F is weaker than between Cl-Cl. Reason:- Atomic size of F is smaller than that of Cl. a) Assertion and reason both are correct statements and reason is correct explanation for assertion. b) Assertion and reason both are correct statements but reason is not correct explanation for assertion. c) Assertion is correct statement but reason is wrong statement. d) Assertion is wrong statement but reason is correct statement.

Assertion :- Nitrogen has higher ionisation enthalpy than that of oxygen. Reason :- Nitrogen has smaller atomic size than that of Oxygen. a) Assertion and reason both are correct statements and reason is correct explanation for assertion. b) Assertion and reason both are correct statements but reason is not correct explanation for assertion. c) Assertion is correct statement but reason is wrong statement. d) Assertion is wrong statement but reason is correct statement.

Assertion:- \(H_2\)O is the only hydrides of the Chalcogens which is liquid. Reason :- In ice each O atom is surrounded by 4H-atom. a) Assertion and reason both are correct statements and reason is correct explanation for assertion. b) Assertion and reason both are correct statements but reason is not correct explanation for assertion. c) Assertion is correct statement but reason is wrong statement. d) Assertion is wrong statement but reason is correct statement.

Assertion:-Nitrogen is restricted to a maximum covalency of 4. Reason:-Nitrogen exists as a diatomic molecule (\(N_2\)) with a triple bond. a) Assertion and reason both are correct statements and reason is correct explanation for assertion. b) Assertion and reason both are correct statements but reason is not correct explanation for assertion. c) Assertion is correct statement but reason is wrong statement. d) Assertion is wrong statement but reason is correct statement.

Assertion:-The stability of hydrides decreases from \(NH_3\) to \(BiH_3\). Reason:-There is a decrease in bond dissociation enthalpy of bond E-H from \(NH_3\) to \(BiH_3\). (E=Element of group 15) a) Assertion and reason both are correct statements and reason is correct explanation for assertion. b) Assertion and reason both are correct statements but reason is not correct explanation for assertion. c) Assertion is correct statement but reason is wrong statement. d) Assertion is wrong statement but reason is correct statement.

Assertion: 1 M glucose will have a higher boiling point than 2 M glucose. Reason: Elevation in boiling point is a colligative property which depends upon the number of particles of solute in the solution. A. If both Assertion and Reason are correct and reason is the correct explanation of Assertion . B. If both Assertion and Reason are correct and reason is not correct explanation of Assertion C. If Assertion is correct but Reason is incorrect. D. If Assertion is incorrect and Reason is correct.

Assertion: An aqueous solution of NaCl freezes below 273 K. Reason: Vapour pressure of the solution is less than that of the pure solvent. A. If both Assertion and Reason are correct and reason is the correct explanation of Assertion . B. If both Assertion and Reason are correct and reason is not correct explanation of Assertion C. If Assertion is correct but Reason is incorrect. D. If Assertion is incorrect and Reason is correct.