In the usual hybrid-orbital model, what geometries and ideal angles correspond to sp³, sp² and sp carbon?

sp³: tetrahedral, about 109.5°; sp²: trigonal planar, about 120°; sp: linear, 180°. Assign hybridization from the local bonding and electron arrangement, not just the presence of a single bond.

How do σ and π bonds differ, and why is rotation about a double bond hindered?

A σ bond has electron density along the internuclear axis; a π bond results from sideways orbital overlap on either side of that axis. Twisting a double bond disrupts π overlap. Single σ bonds can also have rotational barriers or ring constraints.

How do you recognize a tetrahedral carbon stereocenter, and does it guarantee a chiral molecule?

It is a tetrahedral carbon with four distinguishable substituent paths. Assess the whole molecule: meso compounds contain stereocenters but are achiral, and some chiral molecules have no tetrahedral carbon stereocenter.

What are enantiomers, and how do their properties compare?

They are stereoisomers that are nonsuperimposable mirror images. In matched achiral conditions they have the same ordinary physical properties, such as melting point and solubility, and opposite optical rotations. Their interactions with chiral environments, including enzymes, can differ.

What four criteria must a molecule satisfy to be classified as aromatic by Hückel's rule?

A monocyclic system must be cyclic, planar, fully conjugated around the ring (a continuous ring of overlapping p-orbitals), and contain (4n + 2) pi electrons, where n is a non-negative integer (2, 6, 10, 14, …).

What defines an anti-aromatic molecule and why are such systems unusually unstable?

A cyclic, planar, fully conjugated system possessing 4n pi electrons; according to Frost circle analysis, anti-aromatic systems possess unpaired electrons in non-bonding molecular orbitals, destabilizing the system.

What fundamental mechanism describes nucleophilic addition to aldehydes and ketones?

A nucleophile attacks the electrophilic carbonyl carbon, breaking the pi bond and converting the trigonal planar sp2 carbon into a tetrahedral sp3 alkoxide intermediate, followed by protonation.

What factors shift the hydration equilibrium of carbonyl compounds toward gem-diol hydrates?

Formaldehyde and carbonyls with electron-withdrawing alpha-substituents (e.g., chloral) favor hydration because electron deficiency intensifies the electrophilicity of the carbonyl carbon.

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Organic Chemistry Reactions, Mechanisms & NMR Flashcard Decks (6)

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Foundational EN → EN

Organic Chemistry: Bonding, Functional Groups, Acidity & Isomerism

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Organic Stereochemistry: Chirality, Configuration & Conformation

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Nucleophilic Substitution, Elimination & Carbocation Rearrangements

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Organic Chemistry: Alkene & Alkyne Addition Reactions, Oxidation & Reductions

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Organic Chemistry: Aromaticity, Electrophilic & Nucleophilic Aromatic Substitution

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Organic Chemistry: Carbonyl & Enolate Chemistry, Name Reactions & Spectroscopy

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3. Exemplos de Flashcards de Alto Rendimento (Organic Chemistry Reactions, Mechanisms & NMR)

Nível	Frente (Pergunta / Termo)	Verso (Resposta / Explicação)
`basic`	In the usual hybrid-orbital model, what geometries and ideal angles correspond to sp³, sp² and sp carbon?	sp³: tetrahedral, about 109.5°; sp²: trigonal planar, about 120°; sp: linear, 180°. Assign hybridization from the local bonding and electron arrangement, not just the presence of a single bond.
`basic`	How do σ and π bonds differ, and why is rotation about a double bond hindered?	A σ bond has electron density along the internuclear axis; a π bond results from sideways orbital overlap on either side of that axis. Twisting a double bond disrupts π overlap. Single σ bonds can also have rotational barriers or ring constraints.
`basic`	How do you recognize a tetrahedral carbon stereocenter, and does it guarantee a chiral molecule?	It is a tetrahedral carbon with four distinguishable substituent paths. Assess the whole molecule: meso compounds contain stereocenters but are achiral, and some chiral molecules have no tetrahedral carbon stereocenter.
`basic`	What are enantiomers, and how do their properties compare?	They are stereoisomers that are nonsuperimposable mirror images. In matched achiral conditions they have the same ordinary physical properties, such as melting point and solubility, and opposite optical rotations. Their interactions with chiral environments, including enzymes, can differ.
`intermediate`	What is the molecular mechanism of the SN2 reaction?	The nucleophile attacks a saturated carbon from the side opposite the leaving group. Bond formation and bond breaking occur in one concerted step through a transition state, with no intervening intermediate.
`intermediate`	What is the kinetic rate law for an SN2 substitution?	Rate = k[substrate][nucleophile]; it is second-order overall, so doubling either substrate or nucleophile concentration doubles the reaction rate.
`intermediate`	What is Markovnikov's rule in electrophilic additions of HX to asymmetric alkenes?	The electrophilic proton adds to the less substituted carbon of the double bond to generate the more stable, more substituted carbocation intermediate before halide capture.
`intermediate`	Why does treating an alkene with HBr in the presence of peroxides (ROOR) yield anti-Markovnikov regiochemistry?	Peroxides (ROOR) under heat or light initiate a free-radical chain addition (specific to HBr) in which an electrophilic bromine radical (Br•) adds first to the less substituted alkene carbon to form the more stable, more substituted carbon radical intermediate, which then abstracts H• from HBr to give the anti-Markovnikov alkyl bromide.
`advanced`	What four criteria must a molecule satisfy to be classified as aromatic by Hückel's rule?	A monocyclic system must be cyclic, planar, fully conjugated around the ring (a continuous ring of overlapping p-orbitals), and contain (4n + 2) pi electrons, where n is a non-negative integer (2, 6, 10, 14, …).
`advanced`	What defines an anti-aromatic molecule and why are such systems unusually unstable?	A cyclic, planar, fully conjugated system possessing 4n pi electrons; according to Frost circle analysis, anti-aromatic systems possess unpaired electrons in non-bonding molecular orbitals, destabilizing the system.
`advanced`	What fundamental mechanism describes nucleophilic addition to aldehydes and ketones?	A nucleophile attacks the electrophilic carbonyl carbon, breaking the pi bond and converting the trigonal planar sp2 carbon into a tetrahedral sp3 alkoxide intermediate, followed by protonation.
`advanced`	What factors shift the hydration equilibrium of carbonyl compounds toward gem-diol hydrates?	Formaldehyde and carbonyls with electron-withdrawing alpha-substituents (e.g., chloral) favor hydration because electron deficiency intensifies the electrophilicity of the carbonyl carbon.

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