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  1. A thioether

  2. A secondary alcohol

  3. A primary alcohol

  4. A ether

A haloalkane on treatment with NaOR forms ether. Option (4) is correct


  1. 1^{0} amine with same number of carbons

  2. 1^{0} amine with one carbon less

  3. 2^{0} amine with one carbon less

  4. 1^{0} amine with one carbon more

option 2


  1. Two 2-centre 3-electron bonds and four 3-centre 2 -electron bonds
  2. Four 2-centre 3-electron bonds and two 3-centre 2 -electron bonds

  3. Four 2-centre 2-electron bonds and two 3-centre 2 -electron bonds

  4. Two 2-centre 2-electron bonds and four 3-centre 2 -electron bonds

Four 2-centre 2-electron bonds -   4 B-H Two 3-centre 2 -electron bonds  - 2 B-H-B (one Electron of B and on electron H) Option (3) is correct Diborane structure involves Four 2-centre 2-electron bonds and two 3-centre 2 -electron bonds
  1. Na

  2. Mg

  3. Al

  4. K

E.C. of all the elements. 1) Na = Ne 3s1 2) Mg = Ne 3s2 3) K = [Ar] 4s1 4) Al  = [Ne] 3s2 3p1   Now to compare second ionization energy the conf. will be   1) Na = Ne 2) Mg = Ne 3s1 3) K = [Ar] 4) Al  = [Ne] 3s2   Now Sodium and Potassium have achieved their stable conf. i.e noble gas conf. or now are fully filled and thus more stable than Mg and Al. Now in K and Na, Na will have highest second...
  1. 8

  2. 6

  3. 4

  4. 2

This is a charge balancing question.  Fe exists in two forms mainly Ferrous (Fe2+) and Ferric (Fe3+). Let there are 100 oxygen atoms and x number of Fe3+ atoms and 96-x number of Fe2+ atoms. Balance charge The percentage of  Fe3+ ions is,     Option (1) is correct.