Q: Which of the following is the correct expanded structural formula for ethane ($$\mathrm{C_2H_6}$$)?

$$\mathrm{H - C - C - H}$$ \newline Each C has enough H to make four bonds.

Question 1

Which of the following statements best explains why vegetable oil does not dissolve in water?

Accepted Answer

Vegetable oil is an organic compound with nonpolar covalent bonds, while water is polar.

Question 2

Which property is most typical of inorganic compounds?

Accepted Answer

High melting and boiling points

Question 3

Given the formula $$\mathrm{C_3H_8}$$, identify whether it is organic or inorganic and justify your answer.

Accepted Answer

Organic, because it contains only carbon and hydrogen.

Question 4

Which of the following is the correct condensed structural formula for pentane?

Accepted Answer

$$\mathrm{CH_3CH_2CH_2CH_2CH_3}$$

Question 5

Which of the following best describes the shape around each carbon atom in butane ($$\mathrm{C_4H_{10}}$$)?

Accepted Answer

Tetrahedral

Question 6

What is the IUPAC name for the following compound: $$\mathrm{CH_3CH_2CH_2CH_2CH_2CH_2CH_3}$$?

Accepted Answer

Heptane

Question 7

Which of the following is a correct line-angle formula for butane?

Accepted Answer

A zigzag line with four carbon vertices

Question 8

Which of the following is a structural isomer of pentane ($$\mathrm{C_5H_{12}}$$)?

Accepted Answer

$$\mathrm{CH_3CH_2CH(CH_3$)_2}$$

Question 9

A compound is named 2-chloro-3-methylpentane. Which of the following statements is true about its structure?

Accepted Answer

It has a five-carbon chain with a chlorine on carbon 2 and a methyl group on carbon 3.

Question 10

Which of the following is the correct IUPAC name for a cycloalkane with one ethyl group attached to a six-membered ring?

Accepted Answer

Ethylcyclohexane

Question 11

Which of the following best describes the difference between propane ($$\mathrm{C_3H_8}) $$and sodium chloride ($$\mathrm{NaCl}) in $$terms of bonding and properties?

Accepted Answer

Propane has covalent bonds and is flammable; sodium chloride has ionic bonds and is not flammable.

Question 12

Which of the following is the correct expanded structural formula for ethane ($$\mathrm{C_2H_6}$$)?

Accepted Answer

$$\mathrm{H - C - C - H}$$ 
ewline Each C has enough H to make four bonds.

Question 13

Which of the following is a correct statement about cycloalkanes?

Accepted Answer

Cycloalkanes have two fewer hydrogen atoms than their open-chain counterparts.

Question 14

Which of the following is the correct IUPAC name for $$\mathrm{CH_3CH_2CH_2CH_2CH_3}$$?

Accepted Answer

Pentane

Question 15

A molecule has the formula $$\mathrm{C_7H_{14}Cl}. Is it $$organic or inorganic, and why?

Accepted Answer

Organic, because it contains carbon and hydrogen.

Question 16

Which of the following is the correct IUPAC name for a compound with a six-carbon chain, a bromo group on carbon 4, and methyl groups on carbons 2 and 4?

Accepted Answer

4-bromo-2,4-dimethylhexane

Question 17

Which of the following is a correct statement about structural isomers?

Accepted Answer

They have the same molecular formula but different connectivity of atoms.

Question 18

Which of the following is the correct condensed structural formula for 3-bromo-1-chlorobutane?

Accepted Answer

$$\mathrm{CH_2ClCH_2CHBrCH_3}$$

Question 19

Which of the following is the correct IUPAC name for $$\mathrm{CH_3CH_2CH(CH_3$)CH_2CH_3}$$?

Accepted Answer

3-methylpentane

Introduction to Organic Chemistry: Hydrocarbons (GOB Chemistry Study Notes)

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