Question 1

Ritalin is a common drug used to treat ADHD. If the molecular structure of Ritalin contains a phenyl ring, a piperidine ring, and an ethyl ester group, how many carbon atoms are present in the molecule?

Accepted Answer

15

Question 2

Given the following structure: $$\mathrm{CH_3CH_2CH(CH_3$)_2}$$, which of the following is its correct condensed formula?

Accepted Answer

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

Question 3

Which of the following condensed formulas represents n-pentane?

Accepted Answer

$$\mathrm{CH_3CH_2CH_2CH_2CH_3}$$

Question 4

A nitrogen atom in a molecule has three bonds and one lone pair. What is its formal charge?

Accepted Answer

0

Question 5

A nitrogen atom in a molecule has four bonds and no lone pairs. What is its formal charge?

Accepted Answer

+1

Question 6

Which of the following best describes the difference between isopentane and n-pentane?

Accepted Answer

Isopentane is branched, while n-pentane is a straight chain.

Question 7

If a molecule has the condensed formula $$\mathrm{CH_3CH_2CH_2CH_2CH_3}$$, what is its IUPAC name?

Accepted Answer

n-Pentane

Question 8

A student is asked to draw the structure of $$\mathrm{CH_3CH_2CH(CH_3$)_2}. $$Which of the following statements is correct about this molecule?

Accepted Answer

It is a branched alkane called isopentane.

Question 9

Which of the following best explains why the formal charge on a nitrogen atom with two bonds and two lone pairs is $$-1$$?

Accepted Answer

Nitrogen normally forms three bonds and has one lone pair; having two bonds and two lone pairs means it has gained an extra electron.

Question 10

A molecule has the formula $$\mathrm{C_5H_{12}}. $$Which of the following is NOT a possible structure for this molecule?

Accepted Answer

$$\mathrm{CH_3CH_2CH_2CH_3}$$

Question 11

In a real-world scenario, a patient is prescribed Ritalin. If the molecular formula of Ritalin is $$\mathrm{C$$_{14}$$H_{19}NO_2$}$$, how many hydrogen atoms are present in one molecule?

Accepted Answer

19

Question 12

Which of the following statements about the formal charge of nitrogen is correct?

Accepted Answer

A nitrogen atom with three bonds and one lone pair has a formal charge of $$0.$$

Question 13

A molecule has the condensed formula $$\mathrm{CH_3CH_2CH_2CH_2CH_3}. $$Which of the following is a correct statement about its physical properties compared to isopentane?

Accepted Answer

It has a higher boiling point due to less branching.

Question 14

Which of the following is the correct formal charge calculation for a nitrogen atom with four single bonds and no lone pairs?

Accepted Answer

$$\mathrm{Formal\ charge = 5 - (0 + 4) = +1}$$

Question 15

A student is analyzing the structure of Ritalin and counts the number of carbon atoms. Which of the following is a common mistake that could lead to an incorrect count?

Accepted Answer

Forgetting to count the carbon in the ester group.

Organic Chemistry Clicker Questions: Structure, Condensed Formulas, and Formal Charge

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