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PROPERTIES OF HALOGEN CONTAINING COMPOUNDS

A:  
Sol:


     

 

2. Ethyl bromide can be converted into ethyl alcohol by
A: The action of moist silver oxide
Sol:

 

3. Reaction of ethyl chloride with sodium leads to
A: n-butane
Sol:

 

4. Treatment of ammonia with excess of ethyl chloride will yield
A: Tetraethyl ammonium chloride
Sol:

If NH3 is in excess, then 1o amine will be the main product, if C2H5Cl is in excess then mixture of 1o, 2o, 3o and quaternary amine is obtained.

In the above reaction, X stands for

 


A: Light and air
Sol:

 

6. Phosgene is the common name for
A: Carbonyl chloride
Sol:
COCl2 carbonyl chloride is commonly called as phosgene.

 

7. When chloroform is treated with amine and KOH, we get
A: Offensive odour

Sol:

 

8. A mixture of two organic chlorine compounds was treated with sodium metal in ether solution. Isobutane was obtained as a product. The two chlorine compounds are
A: Isopropyl chloride and methyl chloride
Sol:

 

9. Alkyl halides can be converted into Grignard reagents by
A: Warming them with magnesium powder in dry ether
Sol:

 

10. Which is not present in Grignard reagent
       (a) Methyl group      (b) Magnesium     (c) Halogen        (d) −COOH group
A: −COOH group

 

11. The reactivity of ethyl chloride is
A: More than that of benzyl chloride
Sol:

 

12. The reactivity of halogen atom is minimum in
A: Isopropyl chloride

 

13. Chlorobenzene is
A: Less reactive than benzyl chloride

Sol:


    
In chlorobenzene the lone pairs present on Cl atom get involved in resonance with π electrons of benzene due to which C − Cl bond acquires double bond character Hence, reactivity decreases.


     

 

14. The reactivities of methyl chloride, propyl chloride and chlorobenzene are in the order
A: Methyl chloride > propyl chloride > chlorobenzene
Sol:

 

15. Which of the following compound will make precipitate most readily with AgNO3
       (a) CCl3CHO         (b) CHCl3         (c) C6H5CH2Cl       (d) CHI3
A: CHI3
Sol:
    CHI3 gives a yellow ppt. of AgI.

 

16. Carbylamine is liberated when..... is heated with chloroform and alcoholic potash
A: A primary amine

 

17. Salicylic acid can be prepared using Reimer-Tiemann's reaction by treating phenol with
A: Carbon tetrachloride and concentrated sodium hydroxide
Sol:


   

18. Grignard reagent is prepared by the reaction between
A: Magnesium and alkyl halide
Sol:

 

19. Reaction of t-butyl bromide with sodium methoxide produces
A: Isobutylene
Sol:

(methoxide ion CH3 O) is a strong base, therefore it abstract proton from 3o alkyl halide and favours elimination reaction.
 

20. War gas is formed from
A: Chloropicrin
Sol:

 

21. What happens when CCl4 is treated with AgN3
A: Nothing will happen
Sol:   CCl4 + AgNO3   No reaction
         CCl4 is a covalent compound. Therefore does not provide Cl ions.

22. If we use pyrene (CCl4) in the Riemer-Tiemann reaction in place of chloroform, the product formed is
A: Salicylic acid

Sol:

 

23. C6H5CH2Cl + KCN(aq.) X + Y
      Compounds X and Y are
A: C6H5CH2CN + KCl
Sol:

 

24. The bad smelling substance formed by the action of alcoholic caustic potash on chloroform and aniline is
A: Phenyl isocyanide
Sol:

 

25. Ethylidene chloride on treatment with aqueous KOH gives
A: Acetaldehyde
Sol:

 

26. Reaction
       C2H5 I + C5H11 I + 2Na C2H5 − C5H11 + 2NaI is called
A: Wurtz's reaction

 

27. In presence of AlCl3, benzene and n-propyl bromide react in Friedal-Craft's reaction to form
A: Isopropyl benzene
Sol:

 

28. The dehydrobromination of 2-bromobutane gives CH3CH = CHCH3. The product is
A: Saytzeff product
Sol:


    

 

29. Ethylene difluoride on hydrolysis gives
A: Glycol
Sol:


   

 

30. Benzyl chloride when oxidised by pb(NO3)2 gives
A: Benzaldehyde

Sol:

Posted Date : 19-02-2021

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