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Diastereomers have different physical properties. They can be separated by ordinary separation techniques such as fractional crystallization.
On Pluto, where everything is frozen, astronauts discovered two forms of 1, 2-dibromoethane; gauche and anti. Assuming that there are no rotations around single bonds, which statement about the two forms is correct:
Gauche and anti-conformers are stereoisomers not related by mirror-image relationship, hence diastereomers.
The most stable conformation of ethylene glycol is ______.
In the boat conformation of cyclohexane, the most destabilizing interaction is:
Hence D is correct.
The reaction in which stereochemically different molecules react differently is called:
The configurations at the two stereocentres in the compound given below are:
The configuration at the two stereocentres in the compound given below are:
In the following Markonikov addition reaction, the products A and B are:
Epoxidation of (R)-cyclohexene-2-ol with peracetic acid yields a 95:5 mixture of compounds A and B compounds A and B are:
Among the following the most stable isomer for 3-methoxycylohexanol is:
Which of the following term best describes the pair of compounds shown?
The first person to separate a racemic mixture into individual enantiomers is:
Louis Pasteur was the first documented person to separate stereoisomers.
Among the following dibromocyclohexanes, the one that reacts fastest with sodium iodide to give cyclohexene is:
What is the stereochemical relationship between the following two molecules?
Both molecules have the same molecular formula (C9H16BrCl) and the same connectivity. Each molecule also has three stereocenters, marked above with an asterisk, and does not contain a plane of symmetry. Therefore, both molecules are chiral. Using one of the methods outlined in this tutorial, it can be determined that these molecules are superimposable. Therefore, the molecules are identical.
The two substituents in the cis 1,4-disubstituted chair cyclohexane shown are necessarily axial and equatorial, as in (a), (b) and (d). In (c), however, the 1,4-substituents are both equatorial so this is the trans isomer, i.e. a different compound.
The correct order of stability for the following conformations of cyclohexane is:
Which of the following statements can be deduced about the stereochemistry of this compound?
In identifying stereogenic centers, any quaternary or tertiary carbons would be a good place to look. There are no quaternary carbons, and all the tertiary carbons are part of a benzene ring structure.
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