How many stereoisomers are there of the following molecule:

Question

BlackTom AI · Accepted Answer

First, consider the general approach to counting stereoisomers for a given molecule. We typically identify all stereocenters (chiral centers) and assess symmetry that could lead to meso forms.
Option 1: '1' — This would only be the case if there were either no stereocenters or if symmetry consistently collapses all possibilities into a single identical form. Given a typical organic molecule with at least one stereocenter, finding only one stereoisomer would be unusual unless there is no chirality at all, which is unlikely here.
Option 2: '2' — This would occur if there were exactly two stereocenters but an internal plane of symmetry or other constraint creates a meso form, reducing the count from 4 to 2. If the molecule lacks such symmetry, this option would be incorrect.
Option 3: '8' — An eightfold count would imply there are three or more stereocenters (2^3 = 8) with none of them equivalent or meso-related reductions. Without evidence of three independent stereocenters, this number is typically too large for a simple depicted molecule.
Option 4: '4' — This is the common outcome when there are two stereocenters and no meso symmetry; each stereocenter can be R or S independently, giving 2 × 2 = 4 distinct stereoisomers (two pairs of enantiomers). If the molecule has two chiral centers and lacks an internal mirror plane that would produce a meso form, 4 is the correct total.

Applying this reasoning to the given molecule, if the structure presents two stereocenters and no symmetry that would render a meso form, the total number of stereoisomers is 4. This aligns with the standard counting rule 2^n for n independent stereocenters when no meso forms exist.

In summary: option 4 is correct because there are two stereocenters that can be independently configured, yielding 2^2 = 4 stereoisomers, and there is no indicated symmetry to produce a meso form that would reduce the count to 2 or 1. The other options correspond to scenarios with no stereocenters (1), an internal symmetry reducing to 2, or three or more stereocenters (8) which does not apply to this molecule.

How many stereoisomers are there of the following molecule:单项选择题

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