Answer the following questions using the structure provided h) What is the C1-C2
ID: 525420 • Letter: A
Question
Answer the following questions using the structure provided h) What is the C1-C2-N3 bond angle in ethanamine? ____ i) What is the H-Cl-H bond angle? ____ j) What is the bond angle between any two hydrogen on C3? ____ k) How many electrons are involved in sigma bonds ? ____ l) How many electrons are involved in pi bonds? ___ m) Mark as True or False: The C1-C2 bond is: able to freely rotate ___ shorter than the C2-N3 bond ____ an sp^2-sp^2 bond___ n) Draw an MO bonding picture for proponent independently showing the sigma-framework and the pi-framework. Which of the following has the MOST and LEAST amount of ring strain (CIRCLE)? Assign R or S stereochemistry to the chiral centers in the following Fischer Projection.Explanation / Answer
Answer to h) The aminoethene molecule is not planar because of the fact that the N-atom has a pyramidal geometry. However, the rigidity of the sp2 hybridised C-atom will have major contribution to the C-C-N angle and prevent it from prevent high deviations. Hence, the C-C-N bond angle will be slightly more than 120o (approx. 125o).
Answer to i) Since C atom is sp2 hybridised, the H-C-H angle will be 120o.
Answer to j) the N-atom adopts a pyramidal geometry by undergoing hybridisation similar to sp3. Hence the H-N-H angle will be 109.5 o.
Answer to k) A sigma bond is formed by sharing of two electrons, one from each atom, along the bond axis. Let us consider the sigma bonds in this molecule.
There are two sp2 hybridised C-atoms contributing total of 6 electrons towards sigma bond, five s orbitals of hydrogen atoms contributing total of 5 electrons towards sigma bond and a sp3 hybridised N-atom contributing total of 3 electrons towards sigma bond (note remaining two electrons do not take part in sigma bond and stay as lone pair). This totals to 14 electrons involved in seven sigma bonds.
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