Experiment title: friedel-crafts reaction organic technique and overview: this experiment demonstrates a friedel-crafts alkylation of an activated benzene molecule with a tertiary alcohol sulfuric acid acts as the lewis acid catalyst during this substitution involving an attack by an electrophilic trimethylcarbocation. goal of the experiment: to prepare 1,4-di-t-butyl-2-5-dimethoxybenzene . experiment protocol 1). in a test tube, dissolve 250mg of 1,4 dimethoxybenzene in iml acetic acid. it may be necessary to gently warm the mixture to completely dissolve the 1,4 dimethoxybenzene. 2). add 0.4ml of t-butyl alcohol (9 drops). add 0.8ml of concentrated sulfuric acid (20 drops) gently swirl the tube after each drop is added the mixture will heat up with the addition of sulfuric acid 3). allow 10 minutes for the reaction to occur and mix intermittently. cool the tube in an ice bath for 2-3 minutes 4). while still on ice, slowly add 2.5ml of water (approx. 55 drops) to the tube, swirling it after every few drops. remove the water with a pasteur pipette, leaving the crystals. repeat this step with 1.0ml water 5) recrystallize the product from methanol 6) dry the product on filter paper, weigh it, and calculate the yield 1,4-dimethoxybenzene: mw 138.16, mp 57°c

explanation:

the largest database of organic compounds lists about 10 million substances, which include compounds originating from living organisms and those synthesized by chemists. the number of potential organic compounds has been estimated at 1060—an astronomically high number. the existence of so many organic molecules is a consequence of the ability of carbon atoms to form up to four strong bonds to other carbon atoms, resulting in chains and rings of many different sizes, shapes, and complexities. the simplest organic compounds contain only the elements carbon and hydrogen, and are called hydrocarbons. even though they are composed of only two types of atoms, there is a wide variety of hydrocarbons because they may consist of varying lengths of chains, branched chains, and rings of carbon atoms, or combinations of these structures. in addition, hydrocarbons may differ in the types of carbon-carbon bonds present in their molecules. many hydrocarbons are found in plants, animals, and their fossils; other hydrocarbons have been prepared in the laboratory. we use hydrocarbons every day, mainly as fuels, such as natural gas, acetylene, propane, butane, and the principal components of gasoline, diesel fuel, and heating oil. the familiar plastics polyethylene, polypropylene, and polystyrene are also hydrocarbons. we can distinguish several types of hydrocarbons by differences in the bonding between carbon atoms. this leads to differences in geometries and in the hybridization of the carbon orbitals.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally