JEE Main · 2021 · 27 Aug 2021 · Shift 1 · Environmental Chemistry

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The gas 'A' is having very low reactivity reaches to stratosphere. It is non-toxic and nonflammable but dissociated by UV-radiations in stratosphere. The intermediates formed initially from the gas 'A' are :

(A) $\dot{C} H_{3} + \dot{C} F_{2} Cl$
(B) $Cl \dot{O} + \dot{C} F_{2} Cl$
(C) $Cl \dot{O} + \dot{C} H_{3}$
(D) $\dot{Cl} + \dot{C} F_{2} Cl$ ✓ Correct

Answer: (D)

Solution

The description fits a chlorofluorocarbon such as

C F_{2} C l_{2}

: unreactive, non-toxic, non-flammable and able to reach the stratosphere, where ultraviolet light photolyses it. The weakest bond, the

C - Cl

bond, breaks homolytically before the stronger

C - F

bond, releasing a chlorine atom and leaving the

\dot{C} F_{2} Cl

radical. The initial intermediates are

\dot{Cl}

and

\dot{C} F_{2} Cl

JEE Main · 2021 · 27 Aug 2021 · Shift 1 · Single correct option

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JEE Main · 2021 · 27 Aug 2021 · Shift 1 · Environmental Chemistry

Solution

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