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Module 1 - Organic Chemistry Exam Questions With Accurate Solutions 100% correct
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In nucleophilic substitution reactions with alkyl halides the leaving group is? A) A hydroxide group. B) A halide anion. C) A halide cation. D) A carbon atom. E) An ester. - ANSWER-B) A halide anion. Rank the following ions in terms of their leaving group reactivity. Br-, Cl-, I-, F-. ...

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  • October 17, 2024
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  • 2024/2025
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Module 1 - Organic Chemistry Exam
Questions With Accurate Solutions
100% correct

In nucleophilic substitution reactions with alkyl halides the leaving group is?

A) A hydroxide group.

B) A halide anion.

C) A halide cation.

D) A carbon atom.

E) An ester. - ANSWER-B) A halide anion.



Rank the following ions in terms of their leaving group reactivity. Br-, Cl-, I-, F-.

A) Br- > Cl- > F- > I-.

B) I- > Br- > Cl- > F-.

C) Cl- > Br- > F- > I-.

D) F- > Cl- > Br- > I-.

E) F- > Cl- > Br- > I-. - ANSWER-B) I- > Br- > Cl- > F-.



How are basicity and leaving group ability related?

A) They are not related to each other.

B) Good leaving groups are strong bases.

C) Good leaving groups are weak bases. - ANSWER-C) Good leaving groups are weak
bases.



The term SN2 stands for?

A) A solvation reaction.

B) An electrophilic addition reaction.

C) A nucleophilic reaction.

,D) A unimolecular substituent reaction.

E) A bimolecular nucleophilic substitution reaction. - ANSWER-E) A bimolecular
nucleophilic substitution reaction.



The transition state geometry in an SN2 reaction is?

A) Trigonal planar.

B) Tetrahedral.

C) Pentagonal.

D) Trigonal bipyramidal.

E) Octahedral. - ANSWER-D) Trigonal bipyramidal.



The nucleophile in an SN2 reaction approaches the alkyl halide from?

A) Anywhere, is does not matter.

B) The same side of the carbon atom that the halide atom is attached to.

C) The backside of the carbon-halide bond.

D) The side of the carbon-halide bond.

E) The top of the carbon-halide bond. - ANSWER-C) The backside of the carbon-halide
bond.



The strength of a nucleophile depends on several factors, which statement is NOT true?

A) The anion is a stronger nucleophile than the neutral atom, or molecule.

B) More polarizable atoms are better nucleophiles.

C) The degree of solvation affects the nucleophilicity.

D) The connection between nucleophilicity and basicity holds across a row in the
Periodic Table.

E) The connection between nucleophilicity and basicity holds down a column in the
Periodic Table. - ANSWER-E) The connection between nucleophilicity and basicity
holds down a column in the Periodic Table.



The order of carbocation stability is?

, A) 1º > 2º > 3º

B) 2º > 1º > 3º

C) 2º > 3º > 1º

D) 3º > 2º > 1º

E) 3º > 1º > 2º - ANSWER-D) 3º > 2º > 1º



SN1 and SN2 reactions are?

A) both stereospecific

B) both stereoselective

C) stereoselective and stereospecific respectively

D) stereospecific and stereoselective respectively

E) neither stereospecific or stereoselective - ANSWER-C) stereoselective and
stereospecific respectively



Which statement about carbocation rearrangements is false?

A) They are possible in SN1 reactions.

B) They are possible in SN2 reactions.

C) They normally involve the shift of a hydrogen atom.

D) They occur due to the greater stability of 30 carbocations.

E) They occur faster than intermolecular reactions. - ANSWER-B) They are possible in
SN2 reactions.



Which statement about the solvent effects on substitution reactions is false?

A) SN1 reactions are favored by polar solvents with a high dielectric.

B) SN2 reactions are favored by polar aprotic solvents.

C) 10 alkyl halides still react SN2 in polar solvents with a high dielectric.

D) 30 alkyl halides still react SN1 in non-polar solvents.

E) The stereoselectivity for 2º alkyl halides can not be affected by the solvent. -
ANSWER-E) The stereoselectivity for 2º alkyl halides can not be affected by the
solvent.

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