The trigonal bipyramidal geometry results from the hybridisation :

• dsp³ or sp³d

• dsp² or sp²d

• d²sp³ or sp³d²

• d³p² or d²p³

The molecule having smallest bond angle is :

• H₂O

• H₂S

• NH₃

• H₂Te

573.

Which of the following molecules has three-fold axis of symmetry ?

• NH₃

• C₂H₄

• CO₂

• SO₂

Electrons in a paramagnetic compound are :

• shared

• upaired

• donated

• paired

sp³d hybridization results in :

• a square planar molecule

• an octahedron molecule

• a trigonal bipyramidal molecule

• a tetrahedron molecule

Which of the following is correct electron dot structure of N₂O molecule?

• :N=N=Ö:

• $:\mathrm{N}\equiv \stackrel{+}{\mathrm{N}}-\underset{..}{\overset{..}{\mathrm{O}}}:$

• $:\stackrel{..}{\mathrm{N}}=\mathrm{N}=\underset{..}{\overset{..}{\mathrm{O}}}$

• $:\stackrel{..}{\mathrm{N}}=\mathrm{N}-\underset{..}{\overset{..}{\mathrm{O}}}$

Which of the following combination will form an electrovalent bond ?

• P and Cl

• NH₃ and BF₃

• H and Ca

• H and S

C-H bond energy is about 101 kcal/ mol for methane, ethane and other alkanes but is only 77 kcal/ mol for C-H bond of CH₃ in toluene. This is because :

• of inductive effect due to -CH₃ in toluene

• of the presence of benzene ring in toluene

• of resonance among the structures of benzyl radical in toluene

• aromaticity of toluene

Which one of the following compounds has the smallest bond angle in its molecule ?

• SO₂

• OH₂

• SH₂

• NH₃

The molecule which does not exhibit dipole moment is:

• NH₃

• CHCl₃

• H₂O

• CCl₄