Match List-I with List-II.
List-I (Metal)
List-II (Emitted light
wavelength (nm))
(A) Li (I) 670.8 (B) Na (II) 589.2 (C) Rb (III) 780.0 (D) Cs (IV) 455.5
Choose the most appropriate answer from the options given below:
Match List-I with List-II.
List-I (Metal)
| List-II (Emitted light
wavelength (nm)) |
| (A) Li | (I) 670.8 |
| (B) Na | (II) 589.2 |
| (C) Rb | (III) 780.0 |
| (D) Cs | (IV) 455.5 |
Choose the most appropriate answer from the options given below:
- (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
- (A)-(III), (B)-(II), (C)-(I), (D)-(IV)
- (A)-(III), (B)-(I), (C)-(II), (D)-(IV)
- (A)-(IV), (B)-(II), (C)-(I), (D)-(III)
The Correct Option is A
Solution and Explanation
The correct option is(A): (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
| Metal | Li | Na | K | RB | Cs |
| Colour | Crimson-red | Yellow | Violet | Red violet | Blue |
| λ/nm | 670.8 | 589.2 | 766.5 | 780.0 | 455.5 |
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Concepts Used:
Organic Chemistry – Some Basic Principles and Techniques - Reaction Mechanism
SN1 Reaction Mechanism:
SN1 reaction mechanism takes place by following three steps –
- Formation of carbocation
- Attack of nucleophile
- Deprotonation
SN2 Reaction Mechanism:
The SN2 reaction mechanism involves the nucleophilic substitution reaction of the leaving group (which generally consists of halide groups or other electron-withdrawing groups) with a nucleophile in a given organic compound.
Electrophilic Aromatic Substitution Reaction Mechanism:
The mechanism of an electrophilic aromatic substitution reaction contains three main components which are:
- A new sigma bond from C=C is formed during the reaction in the arene nucleophile.
- Due to the breaking of the C-H sigma bond, a proton is removed.
- The C=C bond is reformed and it restores the aromaticity of the compound.
Electrophilic Substitution Reaction Mechanism:
The electrophilic substitution reaction mechanism is composed of three steps, which will be discussed more below.
- Electrophile Generation
- Carbocation Formation
- Proton Removal