Problem: Select the compound that has bond angles nearest to 120°.A. O=C=SB. CHI3C. H2C=O C. CH4 E. H—C≡C—H

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We’re being asked to identify the molecule with bond angles nearest to 120°.


Electron Regions          Electronic Geometry          Bond Angles

2                                      linear                                    180˚

3                                      trigonal planar                      120˚

4                                      tetrahedral                            109.5˚

5                                      trigonal bipyramidal              90˚, 120˚, and 180˚

6                                      octahedral                            90˚ and 180˚


A. O=C=S

Step 1: The total number of valence electrons present in O = C = S 


            Group            Valence Electrons

C        4A                   1 × 4 e4 e

O        6A                   1 × 6 e6 e

S        6A                   1 × 6 e6 e

Total:  16 valence e


Step 2: Lewis Structure


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Problem Details

Select the compound that has bond angles nearest to 120°.

A. O=C=S

B. CHI3

C. H2C=O 

C. CH4 

E. H—C≡C—H