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Which of the following set contains species having same angle around the central atom?SF4,CH4,NH3NF3,BCl3,NH3BF3,NF3,AlCl3BF3,BCl3,BBr3

Question

Which of the following set contains species having same angle around the central atom?SF4,CH4,NH3NF3,BCl3,NH3BF3,NF3,AlCl3BF3,BCl3,BBr3

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Solution

The question is asking for the set of molecules that have the same bond angle around the central atom.

To answer this, we need to understand the VSEPR (Valence Shell Electron Pair Repulsion) theory, which states that the shape of a molecule is determined by the repulsion between the electron pairs in the valence shell of the central atom.

  1. SF4: The sulfur atom has 6 valence electrons. Four of these are used in bonding with fluorine atoms, and the remaining two form a lone pair. According to VSEPR theory, this molecule has a "see-saw" shape, with a bond angle of approximately 120 degrees.

  2. CH4: The carbon atom has 4 valence electrons, all of which are used in bonding with hydrogen atoms. This molecule has a tetrahedral shape, with a bond angle of 109.5 degrees.

  3. NH3: The nitrogen atom has 5 valence electrons. Three of these are used in bonding with hydrogen atoms, and the remaining two form a lone pair. This molecule has a trigonal pyramidal shape, with a bond angle of 107.5 degrees.

  4. NF3: The nitrogen atom has 5 valence electrons. Three of these are used in bonding with fluorine atoms, and the remaining two form a lone pair. This molecule also has a trigonal pyramidal shape, with a bond angle of 107.5 degrees.

  5. BCl3: The boron atom has 3 valence electrons, all of which are used in bonding with chlorine atoms. This molecule has a trigonal planar shape, with a bond angle of 120 degrees.

  6. AlCl3: The aluminum atom has 3 valence electrons, all of which are used in bonding with chlorine atoms. This molecule also has a trigonal planar shape, with a bond angle of 120 degrees.

  7. BF3: The boron atom has 3 valence electrons, all of which are used in bonding with fluorine atoms. This molecule has a trigonal planar shape, with a bond angle of 120 degrees.

  8. BBr3: The boron atom has 3 valence electrons, all of which are used in bonding with bromine atoms. This molecule also has a trigonal planar shape, with a bond angle of 120 degrees.

From the above analysis, the sets of molecules with the same bond angle around the central atom are:

  • NF3, NH3 (107.5 degrees)
  • BCl3, AlCl3, BF3, BBr3 (120 degrees)

This problem has been solved

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