Question

Assertion (A): Amorphous solids possess a long range order in the arrangement of their particles. Reason (R): The formation of amorphous solids involves very rapid cooling. [A] – Assertion & reason both statements are correct and reason is the correct explanation of assertion. [B] – Assertion & reason both are the correct statements but reason is not the correct explanation of the assertion. [C] – Assertion is correct statement and reason is incorrect statement. [D] – Assertion is incorrect statement and reason is correct statement

Assertion: In caesium chloride crystal, Cs⁺ is present on the centre of cube of the unit cell. Reason: For N⁻ atoms adopting fcc arrangement, there are 2N tetrahedral voids. [A] – Assertion & reason both statements are correct and reason is the correct explanation of assertion. [B] – Assertion & reason both are the correct statements but reason is not the correct explanation of the assertion. [C] – Assertion is correct statement and reason is incorrect statement. [D] – Assertion is incorrect statement and reason is correct statement

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: Amino acids in protein remain intact even when it is denatured. Reason: The primary structure of protein is broken to give individual aminoacids on denaturation. 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: Like bromination of benzene, bromination of phenol is also carried out in the presence of Lewis acid. Reason: Lewis acid polarises the bromine molecule. (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: Na⁺ and Al³⁺ are isoelectronic but the magnitude of ionic radius of Al³⁺ is less than that of Na⁺ Reason: The magnitude of an effective nuclear charge on the outer shell electrons in Al³⁺ is greater than that of Na⁺. [A] – Assertion & reason both statements are correct and reason is the correct explanation of assertion. [B] – Assertion & reason both are the correct statements but reason is not the correct explanation of the assertion. [C] – Assertion is correct statement and reason is incorrect statement. [D] – Assertion is incorrect statement and reason is correct statement

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.