What is the electronic configuration of Ca2+ ?

Select the bonds in the 3D representation of methyl urethane below that are multiple bonds. (Hint: Consider the number of bonds attached to an atom in the image compared to the normal valence of that atom. In a valid structure, the number of bonds to an atom will equal the valence of that atom.) • Gray = C: white = H; red = 0; blue = N; dark green = Cl; brown = Br; light green = F; purple = 1; yellow = S: orange = P. • Double click to select bonds. You can zoom in and out using the mouse scroll wheel (or pinch to zoom on touch screens). ●

When B-carotene is oxidised in vivo, it breaks in half and forms two molecules of retinal (vitamin A), which is a precursor to the pigment in the retina responsible for vision. The conjugated system of retinal consists of eleven C atoms and one O atom; see the structure of the molecule here: H3C CH3 ÇH3 ÇH3 `CH3 In the ground state of retinal, each level up to n = 6 is occupied by two electrons. Assuming an average inter-nuclear distance of 140 pm, use the particle-in-a-box model to calculate: a. the separation in energy between the ground state and first excited state in which one electron occupies the state with n = 7, and b. the frequency of the radiation required to produce a transition between these two states.

Among the given organic molecules, Identify the number of molecules which are optically active. Br CI CI c=C= :C C Br H. Br ČI c C= C. Br H. Br Br Br エー

Briefly explain the term ‘chemoselectivity’

Which of the following electronic configuration is not possible?

Are the two carbon atoms of C2H5Cl equivalent?

-C≡C-C6H5   what is this mass of this?

The correct name for the covalen molecule, N5C17 is:

Draw the shape of the PFs molecule and answer the following questions: (i) What is the principal rotation axis of the PFs molecule? (ii) Does the molecule have other rotation axes? If so, what are the other rotation axes of the molecule? (iii) Does the molecule have improper rotation axes? If so, what is the improper rotation axis of the molecule? (iv) Does the molecule have ơ, mirror plane(s)? If so, how many? (v) Does the molecule have ơy mirror plane(s)? If so, how many? (vi) Does the molecule have ơa mirror plane (s)? If so, how many? (vii) What is the point group of the PF, molecule? (viii) What is the order of the point group of the PFs molecule? (ix) Using symmetry criteria, predict if the PFs molecule is polar or non-polar. (x) Using symmetry criteria, predict if the PFs molecule is chiral or non-chiral.