Match List-I with List-II.
| List-I (Metal) | List-II (Application) |
| (A) Cs | (I) High temperature thermometer |
| (B) Ga | (II) Water repellent sprays |
| (C) B | (III) Photoelectric cells |
| (D) Si | (IV) Bullet proof vest |
Choose the most appropriate answer from the options given below:
The correct option is(A): (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
Metal → Application
Cs → Photoelectric cells
Ga → High temperature thermometer
B → Bullet proof vest
Si → Water repellent sprays



SN1 reaction mechanism takes place by following three steps –
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.
The mechanism of an electrophilic aromatic substitution reaction contains three main components which are:
The electrophilic substitution reaction mechanism is composed of three steps, which will be discussed more below.