Haloalkanes And Haloarenes Test

Result

Haloalkanes And Haloarenes Test - 10

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Weekly Quiz Competition

Question 1
1 / -0

The 1% alcohol in chloroform acts as a/an

A
negative catalyst

B
positive catalyst

C
autocatalyst

D
None of these

Solution

The 1% alcohol in chloroform decreases the rate of decomposition of CHCl₃.
It combines with any amount of phosgene formed to form ethyl carbonate. Thus, it acts as a negative catalyst.
Question 2
1 / -0

Which of the following statements is/are correct?

(A) Freon (CCl₂F₂) is prepared by the action of CCl₄ and SbF₃ in the presence of SbCl₅ as a catalyst.
(B) HCFC-123 (CF₃CHCl₂) is used as a substitutes of Freons.
(C) Freons are the trade name of fluoro chloromethane with formula CF_xCl_y, where (x + y) = 5.

A
Only A

B
Only B

C
Both A and B

D
All of these

Solution

Both statements (A) and (B) are correct.

Freon (CCl₂F₂) is prepared by the action of CCl₄ and SbF₃ in the presence of SbCl₅ as a catalyst.

HCFC-123 (CF₃CHCl₂) is used as a substitutes of Freons because the presence of hydrogen atom makes the compound more susceptible to oxidation in the lower atmosphere so that it never reaches the stratosphere.

Also, Freons are the trade name of fluoro chloromethane with formula CF_xCl_y, where (x + y) = 4; e.g. CF₄(Freon-14), CF₃Cl (Freon-13), CF₂Cl₂ (Freon-12) and CFCl₃ (Freon-11).