What are the shapes of ethyne and methane? from Chemistry Chemic

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 Multiple Choice QuestionsMultiple Choice Questions

201.

The formal charges of C and O atoms in CO2 ( :Ö= C=:Ö) are respectively

  • 1, -1

  • -1,1

  • 2,-2

  • 0,0


202.

According to molecular orbital theory, the total number of bonding electron pairs in O2 is

  • 2

  • 3

  • 5

  • 4


203.

Which of the following does not have triple bond between the atoms?

  • N2

  • CO

  • NO

  • C22-


204.

In which one of the following pairs the two species have identical shape, but differ in hybridisation?

  • I3-, BeCl2

  • NH3, BF3

  • XeF2, I3-

  • NH4+, SF4


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205.

What are the shapes of ethyne and methane?

  • Square planar and linear

  • Tetrahedral and trigonal planar

  • Linear and tetrahedral

  • Trigonal planar and linear


C.

Linear and tetrahedral

Ethyne (C2H2)

Number of σ-bonds at C-atom = 2

Number of lone pair of electrons at C-atom = O

∴ Total = 2 + 0 =2

∴ Hybridisation is sp

∴ C2His linear.

Methane (CH4)

Number of σ-bonds at C-atom = 4

Number of-lone pair of electrons at C-atom = 0

∴ Total·= 4+ 0 = 4

∴ Hybridisation is sp3

∴ CH4 is tetraherdal.

 


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206.

The bond angle of bond in methoxy methane is

  • 111.7°

  • 109°

  • 108.9°

  • 180°


207.

Which of the following compounds has zero dipole moment?

  • 1, 4-dichlorobenzene

  • 1, 2-dichlorobenzene

  • 1, 3-dichlorobenzene

  • 1-chloro-2-methyl benzene


208.

The number of electrons is the valence shell of the central atom of a molecules is 8. The molecule is

  • BCl3

  • BeH2

  • SCl2

  • SF6


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209.

Which one of the following has longest covalent bond distance?

  • C—C

  • C—H

  • C—N

  • C—O


210.

In which of the following molecules, all bond lengths are not equal?

  • SF6

  • PCl5

  • BCl3

  • CCl4


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