Design a synthesis of m-bromostyrene from benzene. 1284q Part 1: Choose the best option for the immediate precursor to the target molecule. 1284p1 1284p1b 1284p1a 1284p1e 1284p1d 1284p1c Dehydrohalogenation of the benzylic bromine can result in an alkene. Part 2: Choose the best option for the precursor needed to make the dibromide intermediate. 1284p2 1284p2d 1284p2c 1284p2b 1284p2a 1284p2e Bromination of the benzylic position of an ethyl group is easily accomplished and leads to the desired dibromide. Part 3: Choose the best option for the precursor needed to make the aryl bromide. 1284p3 1284p3a 1284p3e 1284p3d 1284p3c 1284p3b There are reductive methods which will convert a ketone carbonyl group to an methylene carbon (CH2) in one step. Part 4: Choose the best option for the precursor needed to make the keto-bromide intermediate. 1284p4 1284p4a 1284p4e 1284p4d 1284p4c 1284p4b An acetyl group is a meta director and will direct electrophilic bromination of the ring to the meta position. Part 5: Choose the best option for the precursor needed to make acetylbenzene (acetophenone). 1284p5 1284p5b 1284p5a 1284p5e 1284p5d 1284p5c Electrophilic acylation of benzene will give rise to the desired compound. Part 6 out of 12 Here is an overview of your retrosynthesis (there is no work, this is just a recap). 1284p6

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.