Question 1

Which of the following statements best defines isomerism in organic compounds?

Accepted Answer

Isomerism is when compounds have the same molecular formula but different structural arrangements, leading to different properties.

Question 2

Which pair of compounds are functional group isomers?

Accepted Answer

Propanal ($$\mathrm{CH_3CH_2CHO}) $$and Propanone ($$\mathrm{CH_3COCH_3})$$

Question 3

Which of the following best describes a pair of enantiomers?

Accepted Answer

They are non-superimposable mirror images.

Question 4

Which of the following compounds can exhibit cis-trans (geometric) isomerism?

Accepted Answer

2-butene ($$\mathrm{CH_3CH=$$CHCH_3$$})$$

Question 5

Which of the following is a requirement for a molecule to be optically active?

Accepted Answer

It must have at least one chiral center (carbon with four different groups).

Question 6

Which of the following pairs are position isomers?

Accepted Answer

2-pentanol and 3-pentanol

Question 7

Which of the following statements about meso compounds is correct?

Accepted Answer

Meso compounds are achiral despite having chiral centers due to an internal plane of symmetry.

Question 8

Which of the following best describes the difference between enantiomers and diastereomers?

Accepted Answer

Enantiomers are non-superimposable mirror images, while diastereomers are not mirror images.

Question 9

Which of the following is the correct IUPAC name for the compound with the following structure: $$\mathrm{CH_3CH_2CH_2CH_2OH}$$?

Accepted Answer

1-butanol

Question 10

Which of the following statements about the E-Z nomenclature is correct?

Accepted Answer

The Z isomer has the highest priority groups on the same side of the double bond.

Question 11

Which of the following pairs are chain isomers?

Accepted Answer

Butane ($$\mathrm{CH_3CH_2CH_2CH_3}) $$and 2-methylpropane ($$\mathrm{CH_3CH(CH_3$)CH_3$})$$

Question 12

Which of the following is a real-life example of the importance of enantiomers in medicine?

Accepted Answer

Only the S-enantiomer of omeprazole is effective as a gastric protector.

Question 13

Which of the following compounds is chiral?

Accepted Answer

2-bromobutane

Question 14

Which of the following is NOT a type of structural isomerism?

Accepted Answer

Geometric isomerism

Question 15

Which of the following best describes the difference between cis and trans isomers?

Accepted Answer

Cis isomers have identical groups on the same side of a double bond, while trans isomers have them on opposite sides.

Question 16

Which of the following is a pair of functional group isomers?

Accepted Answer

Ethanol ($$\mathrm{CH_3CH_2OH}) $$and Dimethylether ($$\mathrm{CH_3OCH_3})$$

Question 17

A compound with the formula $$\mathrm{C_4H_8}$$ can have how many structural isomers?

Accepted Answer

5

Question 18

Which of the following is true about diastereomers?

Accepted Answer

They have different physical and chemical properties.

Question 19

Which rule is used to assign priorities in the E-Z nomenclature system?

Accepted Answer

Cahn-Ingold-Prelog priority rules

Question 20

Which of the following statements about optical activity is correct?

Accepted Answer

A pure enantiomer rotates plane-polarized light.

Isomería de Compuestos Orgánicos: Estructural y Estereoisomería

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