Answer: The hydroboration of an alkene occurs in TWO CONCERTED STEP which places the boron of the borane on the LESS SUBSTITUTED carbon of the double bond. The oxidizing agent then acts as a nucleophile, attacking the electrophilic BORON and resulting in the placement of a hydroxyl group on the attached carbon. Thus, the major product of the hydroboration oxidation reaction DOES NOT follow Markovnikov's rule.
Explanation:
Hydroboration is defined as the process which allows boron to attain the octet structure. This involves a two steps pathway which leads to the production of alcohol.
--> The first step: this involves the initiation of the addittion of borane to the alkene and this proceeds as a concerted reaction because bond breaking and bond formation occurs at the same time.
--> The second step: this involves the addition of boron which DOES NOT follow Markovnikov's rule( that is, Anti Markovnikov addition of Boron). This is so because the boron adds to the less substituted carbon of the alkene, which then places the hydrogen on the more substituted carbon.
Note: The Markovnikov rule in organic chemistry states that in alkene addition reactions, the electron-rich component of the reagent adds to the carbon atom with fewer hydrogen atoms bonded to it, while the electron-deficient component adds to the carbon atom with more hydrogen atoms bonded to it.
Answer:
C)
Explanation:
It's a covalent bond because O and H are both non metals.
We need to get the mole ratio between the elements. To do this, we will divide by the the smallest number of moles given as follows:
0.5 mole of Na / 0.5 = 1
0.5 mole of S / 0.5 = 1
0.75 mole of O / 0.5 = 3/2
Now, we need to get rid of the fractions. To do this, we will multiply all the ratios by 2:
Na = 1 x 2 = 2
S = 1 x 2 = 2
O = 3/2 x 2 = 3
So, in the simplest formula, the ratio Na:S:O is 2:2:3
This can be written as: Na2S2O3 which is known as sodium thiosulphate.
Answer:
Uruguay became independent of Spain in 1811 and was annexed by Brazil until 1825. Following a three-year federation with Argentina, Uruguay became an independent nation in 1828. Thirty years later, the United States established diplomatic relations with Uruguay and the two nations have since maintained close ties.
Explanation:
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