Which of the following greenhouse gasses is the predominant current driver of climate change, and directly contributes over half of all anthropogenic RF to our atmosphere? a. Hâ‚‚O
b. CH4
c. Halocarbon gasses
d. CO2
e. N2O

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.

Based on its chemical properties, identify the position of each chemical family on the periodic table.

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