1. How many valence electrons does a carbon atom have?

A) 1

B) 2

C) 3

D) 4<<my answer

2. How many double covalent bonds are in an alkane?

A) 0<<my answer

B) 1

C) 2

D) 3

3. What is the general formula for a straight-chain alkane?

A) CnHn

B) CnHn+2

C) CnH2n

D) CnH2n+2<<my answer

4. Why are the molecules of hydrocarbons nonpolar?

A) The intermolecular attractions are strong.

B) All the bonds are single covalent bonds.

C) The electron pair is shared almost equally in all the bonds.<<my answer

D) Van de Waals forces overcome polarity.

5. In which of the following compounds does rotation occur around all covalent bonds between carbons?

A) octene

B) octyne

C) octane<<my answer

D) all of the above

6. An organic compound that contains only carbon and hydrogen and at least one carbon-carbon triple bond is classified as an ____.

A) alkane

B) alkene

C) alkyne<<my answer

D) arene

7. Which of the following compounds is a structural isomer of butane?

A) 2-methylbutane

B) 2, 2-dimethylbutane

C) 2-methylpropane<<my answer

D) 2, 2-diethylpropane

8. Which hydrocarbon rings are most common in nature?

A) rings with 3 or 4 carbon atoms

B) rings with 4 or 5 carbon atoms

C) rings with 5 or 6 carbon atoms<<my answer

D) rings with 6 or 7 carbon atoms

9. What is the first stage in the formation of coal?

A) lignite

B) anthracite coal

C) peat<<my answer

D) bituminous coal

10. What is the first step in the refining of petroleum?

A) cracking

B) drilling

C) cooling

D) distillation<<my answer

13. What substance is added to an organic molecule to test for the degree of saturation?

A) water

B) hydrogen gas

C) bromine<<my answer

D) hydrogen bromide

14. Which of the following compounds has the lowest boiling point?

A) diethyl ether<<my answer

B) 2-butanol

C) diphenyl ether

D) 4-octanol

15. What is the name of the following compound?

O

||

C6H5-C-H

A) phenylhyde

B) cyclohexylhyde

C) benzaldehyde<<my answer

D) phenol aldehyde

16. What is the name of the following compound?

O

||

CH3CCH2CH3

A) butane

B) butanal

C) butanol

D) butanone<<my answer

17. The IUPAC name for the carboxylic acid with two carbons in a straight chain would be ____.

A) ethanalic acid

B) dimethylmethanoic acid

C) methacarboxylic acid

D) ethanoic acid<<my answer

18. When an oxygen atom is attached to a carbon atom, the carbon atom becomes more ____.

A) oxidized<<my answer

B) reduced

C) acidic

D) basic

19. Which of the following compounds is the most reduced?

A) ethene

B) carbon dioxide

C) propanone

D) ethane<<my answer

Thank You.

accurate as of may 2021

full test for honors:
1. D (4)
2. A (0)
3. D (CnH2n+2)
4. C (the electron...)
5. C (octane)
6. C (alkyne)
7. C (2-methylpropane)
8. C (rings with 5 or 6 carbon atoms)
9. C (peat)
10. D (distillation)
11. A ( Cl -- Cl(top)C(middle)H(bottom) -- Cl)
12. D (CH3COH(CH3)2; (CH3)3COH)
13. C (bromine)
14. A (diethyl ether)
15. C (benzaldehyde)
16. D (butanone)
17. D (ethanoic acid)
18. A (oxidized)
19. D (ethane)
20. D (covalent bond)

This are all right

It's all correct. Good job.

U5L11

100% for the test just look up the essay questions on brainy and yes the rephrasing tool (look it up on google) so when you use the check my work link it doesn't mark it as plagiarism

I think 17 is ethanedioc acid; you may have just made a typo in your post I am unsure about #18 and 19.

100% correct on my test

Great job on answering the questions! Here's an explanation of how to arrive at the correct answers for each question:

1. To determine the number of valence electrons in a carbon atom, you look at its position on the periodic table. Carbon is in Group 14, so it has four valence electrons. Therefore, the correct answer is D) 4.

2. An alkane is a hydrocarbon with only single covalent bonds. Therefore, it does not have any double covalent bonds. The correct answer is A) 0.

3. The general formula for a straight-chain alkane is CnH2n+2. This means that for every carbon atom, there are two hydrogen atoms plus two extra hydrogen atoms. The correct answer is D) CnH2n+2.

4. Hydrocarbons are nonpolar because the electron pair in the carbon-hydrogen and carbon-carbon bonds is shared almost equally. The correct answer is C) The electron pair is shared almost equally in all the bonds.

5. In octane, rotation can occur around all covalent bonds between carbons. The correct answer is C) octane.

6. An organic compound that contains only carbon and hydrogen and at least one carbon-carbon triple bond is classified as an alkyne. The correct answer is C) alkyne.

7. A structural isomer of butane means a compound with the same molecular formula but a different structural arrangement. In this case, 2-methylbutane is a structural isomer of butane. The correct answer is A) 2-methylbutane.

8. Rings with 5 or 6 carbon atoms are the most common hydrocarbon rings in nature. The correct answer is C) rings with 5 or 6 carbon atoms.

9. The first stage in the formation of coal is peat. It is formed from plant material in swampy areas that undergoes partial decomposition due to the lack of oxygen. The correct answer is C) peat.

10. The first step in the refining of petroleum is distillation. Distillation separates the crude oil into different fractions based on their boiling points. The correct answer is D) distillation.

11. To test for the degree of saturation in an organic molecule, bromine is added. Bromine readily reacts with unsaturated compounds, such as alkenes or alkynes, turning from orange to colorless. The correct answer is C) bromine.

12. The compound with the lowest boiling point is diethyl ether (C4H10O). It has weaker intermolecular forces compared to the other compounds, resulting in a lower boiling point. The correct answer is A) diethyl ether.

13. The given compound is benzaldehyde, which has a benzene ring attached to an aldehyde group. The correct answer is C) benzaldehyde.

14. CH3CCH2CH3 is the structural formula for butanone. It is a four-carbon compound with a ketone group attached to the second carbon atom. The correct answer is D) butanone.

15. The IUPAC name for the carboxylic acid with two carbons in a straight chain is ethanoic acid. The correct answer is D) ethanoic acid.

16. When an oxygen atom is attached to a carbon atom, the carbon atom becomes more oxidized. The correct answer is A) oxidized.

17. The most reduced compound is ethane (C2H6). It has the maximum number of hydrogen atoms per carbon atom compared to the other compounds. The correct answer is D) ethane.

I hope this helps! Let me know if you have any more questions.