Regents Chemistry Test Preparation Practice Organic Chemistry

Which element has atoms that can bond to each other in rings and networks?*

(1) aluminum

(2) carbon

(3) hydrogen

(4) oxygen

Given the formulas of four organic compounds:

organic-chemistry, organic-compounds, organic-chemistry, organic-compounds, moles-and-stoichiometry, formulas, moles-and-stoichiometry, compounds fig: chem12013-exam_g11.png

Which compounds have the same molecular formula?*

(1) A and B

(2) A and C

(3) D and B

(4) D and C

Which formula represents an organic compound?*

(1) CaH₂

(2) C₄H₈

(3) H₂O₂

(4) P₂O₅

Which condensed structural formula represents an unsaturated compound?*

(1) CH₃CHCHCH₃

(2) CH₃CH₂CH₃

(3) CH₃CH₃

(4) CH₄

Which element is present in all organic compounds?*

(1) nitrogen

(2) oxygen

(3) carbon

(4) sulfur

Given the formula for a compound:

moles-and-stoichiometry, formulas, organic-chemistry, organic-compounds, moles-and-stoichiometry, compounds fig: chem12016-exam_g5.png

A chemical name for this compound is*

(1) butanal

(2) butanol

(3) butanone

(4) butanoic acid

Which formula represents an alkane?*

(1) C₂H₂

(2) C₂H₄

(3) C₃H₄

(4) C₃H₈

Given the formula representing a compound:

organic-chemistry, organic-compounds, moles-and-stoichiometry, formulas, moles-and-stoichiometry, compounds fig: chem12017-exam_g9.png

What is the IUPAC name of this compound?*

(1) 2-chloroheptane

(2) 6-chloroheptane

(3) 2,2-dichloroheptane

(4) 6,6-dichloroheptane

Which formula represents an alkyne?*

(1) C_nH_n

(2) C_2nH_n

(3) C_nH_{2n + 2}

(4) C_nH_{2n– 2}

Which compounds are isomers of each other?*

(1) methanol and methanal

(2) propanoic acid and pentanoic acid

(3) 1-propanol and 2-propanol

(4) 1-chloropropane and 2-bromopropane

Base your answers to questions 11 on the information below.

Two hydrocarbons that are isomers of each other are represented by the structural formulas and molecular formulas below.

chemical-bonding, chemical-bonds, organic-chemistry, hydrocarbons, organic-chemistry, hydrocarbons fig: chem12012-exam_g15.png

Explain, in terms of structural formulas and molecular formulas, why these hydrocarbons are isomers of each other.*

Base your answers to questions 12 on the information below.

The active ingredient in the pain reliever aspirin is acetylsalicylic acid. This compound can be produced by reacting salicylic acid with acetic acid. The label of one aspirin bottle indicates that the accepted mass of acetylsalicylic acid in each tablet is 325 milligrams.

In a laboratory, an aspirin tablet is crushed and mixed with water to dissolve all of the acetylsalicylic acid. The measured pH of the resulting solution is 3.0.

Write the chemical formula for the acetic acid.*

Base your answers to questions 13 on the information below and on your knowledge of chemistry.

Table sugar, sucrose, is a combination of two simple sugars, glucose and fructose. The formulas below represent these simple sugars.

organic-chemistry, functional-groups-and-types-of-organic-compounds fig: chem12014-exam_g10.png

Explain, in terms of atoms and molecular structure, why glucose and fructose are isomers of each other.*

Base your answers to questions 14 on the information below and on your knowledge of chemistry.

Rubbing alcohol is a product available at most pharmacies and supermarkets. One rubbing alcohol solution contains 2-propanol and water. The boiling point of 2-propanol is 82.3°C at standard pressure.

Draw a structural formula for the 2-propanol.*

Base your answers to questions 15 on the information below and on your knowledge of chemistry.

The diagrams below represent ball-and-stick models of two molecules. In a ball-and-stick model, each ball represents an atom, and the sticks between balls represent chemical bonds.

chemical-bonding, electron-dot-diagrams-(lewis-structures), atomic-concepts, valence-electrons, chemical-bonding, electron-dot-diagrams-(lewis-structures) fig: chem12015-exam_g17.png

Explain why the molecules in diagrams A and B are isomers of each other.*