Substitution vs elimination idea

What is nucleophilic substitution?

A reaction where a nucleophile replaces a leaving group in a molecule.

Define elimination reaction.

A reaction that removes a small molecule (like water) to form a double bond.

True or False: Substitution always results in a saturated product.

False, because substitution can maintain or create double bonds.

Difference between SN1 and SN2.

SN1 is unimolecular and involves a carbocation; SN2 is bimolecular and involves a concerted mechanism.

Which reaction involves a carbocation intermediate?

SN1 reactions involve a carbocation intermediate during substitution.

Fill in the blank: Elimination reactions often produce ______.

alkenes or alkynes.

What is a leaving group?

An atom or group that departs from the substrate, enabling nucleophilic attack.

True or False: Elimination reactions favor polar protic solvents.

True, because polar protic solvents stabilize the charged intermediates.

How do temperature effects differ?

Higher temperatures favor elimination; lower temperatures favor substitution.

What is Zaitsev's rule?

In elimination, the more substituted alkene is usually the major product.

Define stereospecificity.

Reactions that lead to a specific stereoisomer as the product.

Difference between E1 and E2 reactions.

E1 is unimolecular and involves a carbocation; E2 is bimolecular and occurs in a concerted step.

What does the term 'nucleophile' mean?

A species that donates an electron pair to form a new bond.

True or False: SN2 reactions are favored by tertiary substrates.

False, because SN2 reactions are hindered by steric bulk in tertiary substrates.

Which mechanism is faster, SN1 or SN2?

SN2 is generally faster due to its concerted mechanism.

Fill in the blank: SN1 mechanisms typically involve ______ solvents.

polar protic solvents.

What role does the base play in E2 reactions?

The base abstracts a proton, allowing elimination to occur.