As a group, all of the f-block elements (those that use their remaining electrons to fill an f sublevel orbital) are known as the
a. actinide series
c. lanthanide series
b. inner transition metals
d. transition metals

Which statement justifies that phosphine (ph3) is a polar molecule?

What are fructose and glucose an example of?

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н,о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.