Question

Can I please have answers to all the parts.

H. 5 4 HH N H HH 2 H Н. С C C 1 Η 6 HH HH For parts A-G, provide a numerical answer in the blank (ex. 7). For parts H-J, answer with YES or NO (capitalized letters only). Note: Lone pairs electrons have been omitted. All formal charges are equal to zero. a) Total number of o-bonds in this molecule? 29 b) Total number of ri-bonds in this molecule? 6 c) Total number of sp3 hybrid orbitals that each contain a lone pair? d) Total number of sp2 hybrid orbitals that each contain a lone pair? e) Total number of atoms that exclusively use unhybridized orbitals for bonding? f) Total number of atoms that exclusively use hybridized orbitals for bonding? g) Total number of atoms that use some combination of hybridized and unhybridized orbitals for bonding? h) Is it possible to rotate the bond between the atoms labelled "4" and "5"? i) Is it possible to rotate the bond between the hydrogen atom labelled "3", and the carbon atom that it is bonded to? j) Has this molecule been drawn with a maximal number of coplanar atoms?

Answer 1

a). Total no. of sigma bonds in the molecule are 30. (15 C-H+12 C-C+2 C-O+1C-N)

b.) Total no. of pi bonds in molecule are 6 (4 C=C+ 2 in C-tripple bond-N)

c). Total no. sp3 hybrid orbitals containing lone pairs is 1. i. e. O-atom labeled 1.

d). Total no. of sp2 hybrid orbitals containing lone pairs is 0. C-atoms have no lone pairs while N-atom in CN group does have a lone pair but it is sp hybridised.

e.) There are only H-atoms which undergoes bonding exclusively with unhybridised orbitals. Total no. is 15.

f.) Total 5 no. of atoms exclusively uses hybridised orbitals for bonding( 3 C-atoms from CH3 groups, 1 C-atom from CH2 group, 1 O-atom)

g.) All rest of the atoms in the molecule uses combination of hybridised and unhybridised orbitals for bonding, total no. is 10.

h.) No. It is impossible to rotate the bond between C and N atom as it is a tripple bond involving two pi bonds which are formed exclusivley from sidewise overlap of unhybridised orbitals. Hence no rotation without breaking the bonds.

i.) Yes, it can be rotated. It is a C-H sigma bond and can be rotated.

j.) Yes, it is drawn with maximum no. of atom in the same plane.