Match List-I with List-II
|
List-I Compounds |
List-II Uses |
|
(A) Dichloromethane |
(I) Freon R 22 |
|
(B) Trichloromethane |
(II) Synthesis of Chlorofluorocarbons |
|
(C) Triiodomethane |
(III) Propellant |
|
(D)Tetrachloromethane |
(IV) Antiseptic |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
The polyhalogen derivatives of methane each have a typical use that follows from their properties: volatility (propellants), the ability to exchange chlorine for fluorine (raw materials for refrigerants) or the slow release of a halogen (antiseptics).
(A) Dichloromethane — This matches (III) Propellant. \( \ce{CH2Cl2} \) is a volatile liquid used as a solvent and as a propellant in aerosols.
(B) Trichloromethane — This matches (I) Freon R 22. Chloroform is used in the production of the refrigerant R-22 (\( \ce{CHClF2} \)) by exchanging two chlorine atoms for fluorine:
\( \displaystyle \ce{CHCl3 + 2HF} \xrightarrow{\ce{SbCl5}} \ce{CHClF2 + 2HCl} \)
(C) Triiodomethane — This matches (IV) Antiseptic. Iodoform was used as an antiseptic; its action is due to the iodine it liberates, not to iodoform itself.
(D)Tetrachloromethane — This matches (II) Synthesis of Chlorofluorocarbons. Carbon tetrachloride is the feedstock for chlorofluorocarbons such as freon-12:
\( \displaystyle \ce{CCl4 + 2HF} \xrightarrow{\ce{SbCl5}} \ce{CCl2F2 + 2HCl} \)
Shortcut: (A)-(III) appears only in Option (4).