13 Acetylene is a _________ molecule having cylindrically symmetrical π (pi) electron density about the internuclear axis.
bent
tetrahedral
linear
trigonal planar
14 An alkane with 7 carbon atoms contains _____ hydrogen atoms.
16
14
20
18
15 A ____________can be defined as an atom or a group of atoms in a molecule which exhibits characteristic chemical properties.
Isomeric group
Structural group
Fucntional group
Hybridized group
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