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Chemical Bonding and Molecular Structure question

2017 · 9 Apr · Shift 1 · Q12
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Chemical Bonding and Molecular Structure question

2017 · 9 Apr · Shift 1 · Q12

JEE MainChemistryChemical Bonding and Molecular StructureMCQ+4 / −1
The group having triangular planar structures is :
  1. A
    BF3BF_3BF3​, NF3NF_3NF3​, CO32−CO_3^{2 - }CO32−​
  2. B
    CO32−CO_3^{2 - }CO32−​, NO3−NO_3^ -NO3−​, SO3SO_3SO3​
  3. C
    NH3NH_3NH3​, SO3SO_3SO3​, CO32−CO_3^{2 - }CO32−​
  4. D
    NCl3NCl_3NCl3​, BCl3BCl_3BCl3​, SO3SO_3SO3​
View written solutionFree

Correct answer: B

  1. Identify which species are trigonal planar

A molecule/ion is trigonal planar when the central atom has:

  • 333 bond pairs,
  • 000 lone pairs,
  • hence sp2sp^2sp2 hybridisation and bond angle about 120∘120^\circ120∘.
  1. Check each species

(i) BF3BF_3BF3​

  • Central atom: BBB
  • Boron forms 333 bonds and has no lone pair.
  • Shape: trigonal planar.

(ii) NF3NF_3NF3​

  • Central atom: NNN
  • Nitrogen has 333 bond pairs and 111 lone pair.
  • Electron geometry: tetrahedral
  • Molecular shape: trigonal pyramidal, not trigonal planar.

(iii) CO32−CO_3^{2-}CO32−​

  • Central atom: CCC
  • Carbon has 333 sigma bonds and no lone pair.
  • Shape: trigonal planar.

(iv) NO3−NO_3^-NO3−​

  • Central atom: NNN
  • Nitrogen has 333 bonding regions and no lone pair.
  • Shape: trigonal planar.

(v) SO3SO_3SO3​

  • Central atom: SSS
  • Sulfur has 333 bonding regions and no lone pair.
  • Shape: trigonal planar.

(vi) NH3NH_3NH3​

  • Central atom: NNN
  • 333 bond pairs and 111 lone pair.
  • Shape: trigonal pyramidal, not trigonal planar.

(vii) NCl3NCl_3NCl3​

  • Central atom: NNN
  • 333 bond pairs and 111 lone pair.
  • Shape: trigonal pyramidal, not trigonal planar.

(viii) BCl3BCl_3BCl3​

  • Central atom: BBB
  • 333 bond pairs and no lone pair.
  • Shape: trigonal planar.
  1. Evaluate each option

Option A: BF3BF_3BF3​, NF3NF_3NF3​, CO32−CO_3^{2-}CO32−​

  • BF3BF_3BF3​ planar
  • NF3NF_3NF3​ not planar
  • CO32−CO_3^{2-}CO32−​ planar

So, not all are trigonal planar. Incorrect.

Option B: CO32−CO_3^{2-}CO32−​, NO3−NO_3^-NO3−​, SO3SO_3SO3​

  • CO32−CO_3^{2-}CO32−​ planar
  • NO3−NO_3^-NO3−​ planar
  • SO3SO_3SO3​ planar

All are trigonal planar. Correct.

Option C: NH3NH_3NH3​, SO3SO_3SO3​, CO32−CO_3^{2-}CO32−​

  • NH3NH_3NH3​ not planar
  • SO3SO_3SO3​ planar
  • CO32−CO_3^{2-}CO32−​ planar

So, incorrect.

Option D: NCl3NCl_3NCl3​, BCl3BCl_3BCl3​, SO3SO_3SO3​

  • NCl3NCl_3NCl3​ not planar
  • BCl3BCl_3BCl3​ planar
  • SO3SO_3SO3​ planar

So, incorrect.

  1. Final Answer

The correct group having triangular planar structures is: B\boxed{B}B​

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