Question
Which molecules show an appropriate number of bonds around each carbon atom?
Select the three that apply.
View Available Hint(s)for Part A
CH3CH2CH2OH with an OH group attached to the third (from left to right) carbon.
H2NCHCOH with an O atom double-bonded to the second (from left to right) carbon.
There is a six-membered ring. An oxygen atom is double-bonded to the first and the fifth (clockwise) members. An H atom is attached to the second, the third, the fourth, and the sixth members. There is a double bond between the second and the third members. The fourth and the sixth members are N atoms, and the other members are C atoms.
H2CCHCH2 with one OH group attached to the first (from left to right) and the second carbons and an O atom double-bonded to the third carbon.
CH2CHCH3 with a double bond between the first (from left to right) and second carbons.
Select the three that apply.
View Available Hint(s)for Part A
CH3CH2CH2OH with an OH group attached to the third (from left to right) carbon.
H2NCHCOH with an O atom double-bonded to the second (from left to right) carbon.
There is a six-membered ring. An oxygen atom is double-bonded to the first and the fifth (clockwise) members. An H atom is attached to the second, the third, the fourth, and the sixth members. There is a double bond between the second and the third members. The fourth and the sixth members are N atoms, and the other members are C atoms.
H2CCHCH2 with one OH group attached to the first (from left to right) and the second carbons and an O atom double-bonded to the third carbon.
CH2CHCH3 with a double bond between the first (from left to right) and second carbons.
Answers
GPT-4o mini
To determine which molecules show an appropriate number of bonds around each carbon atom, we need to remember that carbon typically forms four bonds (single, double, or triple):
1. **CH3CH2CH2OH (propan-1-ol)**: The first carbon (CH3) has 4 bonds, the second carbon (CH2) has 2 bonds, the third carbon (CH2) has 2 bonds, and the carbon to which the OH group is attached also maintains 4 bonds (with the OH group counted as one bond).
- **Bonds: 1st carbon = 4, 2nd carbon = 4, 3rd carbon = 4.** All carbons have an appropriate number of bonds.
2. **H2NCHCOH**: The first carbon (attached to the NH2) has 3 bonds (one to the N, one to the second carbon, and one to the OH). The second carbon has 4 bonds (1 to the first carbon, 1 to the third carbon, and 1 double bond to O). The third carbon has 4 bonds (1 to the second carbon, 1 to the OH).
- **Bonds: 1st carbon = 3, 2nd carbon = 4, 3rd carbon = 4.** The first carbon does not have enough bonds (only 3).
3. **Cyclic structure with N atoms**: In the described six-membered structure (two N atoms and four C atoms), we need to examine each member: each carbon forms the appropriate number of bonds; C atoms with double bonds have 4 total bonds.
- **Bonds: 1st carbon = 4, 2nd carbon (with double bond) = 4, 3rd carbon = 4, 4th carbon = 4.** All carbons have the right number of bonds.
4. **H2CCHCH2**: The first carbon (H2C) forms 3 bonds (2 with H and 1 with the second carbon). The second carbon has 3 bonds (1 with first, 1 with OH, and 1 with the third carbon). The third carbon also forms 4 bonds (2 with OH and the two CH2).
- **Bonds: 1st carbon = 3, 2nd carbon = 4, 3rd carbon = 4.** The first carbon does not have enough bonds (3).
5. **CH2CHCH3**: The first carbon (with one bond to the second) has 3 bonds (1 to the second). The second carbon forms 4 bonds (2 to CH2 and 1 to CH3). The carbon forming double bond also makes 4 total bonds.
- **Bonds: 1st carbon = 3, 2nd carbon = 4, 3rd carbon = 4.** The first carbon does not have enough bonds.
Therefore, the molecules that show an appropriate number of bonds are:
1. **CH3CH2CH2OH**
2. **Cyclic structure with 2 N atoms**
3. **H2CCHCH2** does not contribute as the first has not enough bonds.
The correct answers are molecules 1 and 3 based on counting carbon bonds accurately. The second molecule has two evident discrepancies.
So, the correct selections are:
- **CH3CH2CH2OH**
- **Cyclic structure with 2 N atoms**
- **CH2CHCH3**
Please verify the cyclic structure form coinciding with carbon bonds.
1. **CH3CH2CH2OH (propan-1-ol)**: The first carbon (CH3) has 4 bonds, the second carbon (CH2) has 2 bonds, the third carbon (CH2) has 2 bonds, and the carbon to which the OH group is attached also maintains 4 bonds (with the OH group counted as one bond).
- **Bonds: 1st carbon = 4, 2nd carbon = 4, 3rd carbon = 4.** All carbons have an appropriate number of bonds.
2. **H2NCHCOH**: The first carbon (attached to the NH2) has 3 bonds (one to the N, one to the second carbon, and one to the OH). The second carbon has 4 bonds (1 to the first carbon, 1 to the third carbon, and 1 double bond to O). The third carbon has 4 bonds (1 to the second carbon, 1 to the OH).
- **Bonds: 1st carbon = 3, 2nd carbon = 4, 3rd carbon = 4.** The first carbon does not have enough bonds (only 3).
3. **Cyclic structure with N atoms**: In the described six-membered structure (two N atoms and four C atoms), we need to examine each member: each carbon forms the appropriate number of bonds; C atoms with double bonds have 4 total bonds.
- **Bonds: 1st carbon = 4, 2nd carbon (with double bond) = 4, 3rd carbon = 4, 4th carbon = 4.** All carbons have the right number of bonds.
4. **H2CCHCH2**: The first carbon (H2C) forms 3 bonds (2 with H and 1 with the second carbon). The second carbon has 3 bonds (1 with first, 1 with OH, and 1 with the third carbon). The third carbon also forms 4 bonds (2 with OH and the two CH2).
- **Bonds: 1st carbon = 3, 2nd carbon = 4, 3rd carbon = 4.** The first carbon does not have enough bonds (3).
5. **CH2CHCH3**: The first carbon (with one bond to the second) has 3 bonds (1 to the second). The second carbon forms 4 bonds (2 to CH2 and 1 to CH3). The carbon forming double bond also makes 4 total bonds.
- **Bonds: 1st carbon = 3, 2nd carbon = 4, 3rd carbon = 4.** The first carbon does not have enough bonds.
Therefore, the molecules that show an appropriate number of bonds are:
1. **CH3CH2CH2OH**
2. **Cyclic structure with 2 N atoms**
3. **H2CCHCH2** does not contribute as the first has not enough bonds.
The correct answers are molecules 1 and 3 based on counting carbon bonds accurately. The second molecule has two evident discrepancies.
So, the correct selections are:
- **CH3CH2CH2OH**
- **Cyclic structure with 2 N atoms**
- **CH2CHCH3**
Please verify the cyclic structure form coinciding with carbon bonds.