What is the bond angle and geometry that corresponds to carbon 4 (circled) in ring A of chlortetracycline (aureomycin®)?[Fill in the blank]

Question

BlackTom AI · Accepted Answer

Carbon 4 is an sp2-hybridized carbon with trigonal planar geometry and ~120° bond angles.

Relevant concepts: hybridization is determined by the number of electron domains (sigma bonds + lone pairs) around a carbon. An sp2 carbon has three electron domains and adopts trigonal planar geometry with bond angles near 120°. A tetrahedral (sp3) carbon has four sigma bonds/lone pairs and ~109°, and an sp carbon is linear (180°).

Step-by-step reasoning:
1. Count the electron domains on carbon 4. In the tetracycline ring, C4 is bonded to three atoms (two neighboring ring carbons + one substituent/functional group). One of these connections may be a double bond, but a double bond occupies a single electron domain for geometry purposes.
2. There are no lone pairs on a typical ring carbon, so total electron domains = 3 (three sigma bonds/domains).
3. Three electron domains correspond to sp2 hybridization. sp2 hybrid orbitals lie in one plane, giving trigonal planar geometry.
4. The ideal bond angles for trigonal planar geometry are 120°, so the bond angles around C4 are approximately 120°.
5. Conjugation and ring resonance reinforce planarity for aromatic or conjugated ring carbons, keeping the geometry close to 120°.

Why the other choices are incorrect:
- (a) 109° and tetrahedral: requires four electron domains (sp3); C4 has only three, so not tetrahedral.
- (b) 120° and tripodal: the angle matches but "tripodal" is not the correct IUPAC geometry term; the proper term for three domains is trigonal planar.
- (d) 180° and linear: linear geometry requires two electron domains (sp), which is not the case here.

Thus C4 is trigonal planar with ~120° bond angles, matching the provided correct answer: 120° and trigonal planar.

What is the bond angle and geometry that corresponds to carbon 4 (circled) in ring A of chlortetracycline (aureomycin®)?[Fill in the blank]单项选择题

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