All India Engineering / Architecture Entrance Examination (AIEEE)

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AIEEE 2009 Chemistry

Q. 21. The IUPAC name of neopentane is:

1. 2,2–dimethylbutane
   
   
2. 2–methylbutane
   
   
3. 2,2-dimethylpropane
   
   
4. 2–methylpropane

Sol.:  
 

Answer: (3)

Q. 22. In context with the transition elements, which of the following statements is incorrect?

1. Once the d⁵ configuration is exceeded, the tendency to involve all the 3d electrons in bonding decreases.
   
   
2. In addition to the normal oxidation states, the zero oxidation state is also shown by these elements in complexes.
   
   
3. In the highest oxidation states, the transition metal show basic character and form cationic complexes.
   
   
4. In the highest oxidation states of the first five transition elements (Sc to Mn), all the 4s and 3d electrons are used for bonding.

Sol.: In highest oxidation state, the transition metal will form complexes which will have large degree of covalent character, which shows the acidic behaviour.

Answer: (3)

 Q. 23. Which of the following pairs represents linkage isomers?

1. [PtCl₂(NH₃)4]Br₂ and [PtBr₂(NH₃)₄]Cl₂
   
   
2. [Cu(NH₃)₄][PtCl₄] and [Pt(NH₃)₄] [CuCl₄]
   
   
3. [Pd(PPh₃)₂(NCS)₂] and [Pd(PPh₃)₂(SCN)₂]
   
   
4. [Co(NH₃)5NO₃]SO₄ and [Co(NH₃)5SO₄]NO₃

Sol: Linkage isomerism is shown by ambidentate ligands. (SCN– and NCS– are ambidentate groups).

Answer: (3)