Class XII : Chemistry: Organic Chemistry assignment

CLASS-XII

ORGANIC CHEMISTRY

1. Arrange the following in order of increasing boling point:

1. Bromobenzene, chlorobenzene,iodobenzene
2. N-pentylchloride, neo-pentyl & iso-pentyl chloride (give reason)
    

      2. Account of the following

1. Methyl chloride is more readily hydrolysed then chlorobenzene
2. Ammonolysis of alkyl halides does not give a corresponding amine in pure state.
3. CHCl₃ does not give white ppt. with AgNo₃
4. CHCL₃ is stored in dark coloured bottles.
5. C-cl bond length is chlorobenzene is shorter then in CH₃-Cl.
    

       3.Allyl chloride is more reactive than n-propyl chloride towards nuclephilie substitution reaction . Explain why?
       4.    HaloalKanes easily dissolve in organic solvents, why?
      5   Racemic mixture is optically inactive. Why?
      6  What are the IUPAC names of the insecticide DDT & BHC? Why is their use banned now a days?
     7  An optically active compound having molecular formula C₇H₁₅Br reacts with ag.KOH to give a racemic mixture of products. Write the mechanism involved for thIs reaction.
     8.  An organic compound `A’  having molecular formula C4H8 on treatment with dil-H2SO<sub>4</sub> given `B’. `B’ treatment with conc-HCl and anhydrous ZnCl₂ gives C and an treatment with sodium ethoxide gives back A. Identify A,B,C & write the equations involved.
   9  Which halogen compound in each of the following pairs will react faster in SN₂ reaction: (Give reason also)

1. CH₃ Br or CH₃I
2. (CH₃)₃C-CL OR CH₃-CL