$$PMI = \\frac{Total\\ mass\\ input}{Mass\\ of\\ product}$$

Question 1

Which of the following best describes the concept of Atom Economy in green chemistry?

Accepted Answer

It measures the percentage of reactants converted into desired products, minimizing waste.

Question 2

Which hybridization is present in the carbon atom of methane ($$CH_4$$)?

Accepted Answer

$$sp^3$$

Question 3

A molecule has a central atom with three regions of electron density and no lone pairs. What is its expected bond angle?

Accepted Answer

$$120^\circ$$

Question 4

Which of the following molecules is expected to have the highest dipole moment?

Accepted Answer

Water ($$H_2O)$$

Question 5

Which statement about resonance structures is correct?

Accepted Answer

Resonance structures are hypothetical and the true structure is a hybrid of all possible resonance forms.

Question 6

Which functional group is present in both aldehydes and ketones?

Accepted Answer

Carbonyl group ($$C=O)$$

Question 7

Which of the following best explains why $$NH_3 ($$ammonia) is polar?

Accepted Answer

It has a trigonal pyramidal geometry and a lone pair on nitrogen.

Question 8

Which of the following is a correct representation of a condensed structural formula for ethanol?

Accepted Answer

$$CH_3CH_2OH$$

Question 9

Which of the following molecules contains a delocalized $$\pi$$ electron system?

Accepted Answer

Benzene ($$C_6H_6)$$

Question 10

A student draws a Lewis structure for $$CO_2$$ showing a single bond between carbon and each oxygen. What is the error in this structure?

Accepted Answer

Each carbon-oxygen bond should be a double bond.

Question 11

Which of the following is NOT a valid resonance structure for the nitrate ion ($$NO_3$$^-$$)?

Accepted Answer

A structure with three double bonds and no charges.

Question 12

Which of the following best describes the difference between localized and delocalized electrons?

Accepted Answer

Localized electrons are confined between two atoms, while delocalized electrons are spread over several atoms.

Question 13

Which of the following molecules is expected to have the strongest London dispersion forces?

Accepted Answer

Hexane ($$C_6H_{14})$$

Question 14

Which of the following is the correct order of increasing bond strength for the following bonds: single, double, triple?

Accepted Answer

Single \u003c Double \u003c Triple

Question 15

Which of the following is a correct example of a primary alcohol?

Accepted Answer

Ethanol ($$CH_3CH_2OH)$$

Question 16

Which of the following best explains why $$CCl_4 is $$nonpolar despite having polar bonds?

Accepted Answer

The molecule is tetrahedral and the dipoles cancel due to symmetry.

Question 17

Which of the following is the correct molecular geometry for $$BF_3$$?

Accepted Answer

Trigonal planar

Question 18

Which of the following is a correct representation of a Fischer projection for D-glucose?

Accepted Answer

A cross-shaped structure with the $$CHO$$ group at the top and $$CH_2OH at $$the bottom, with hydroxyl groups alternating left and right.

Question 19

Which of the following is the correct process mass intensity (PMI) formula?

Accepted Answer

$$PMI = \frac{Total\ mass\ input}{Mass\ of\ product}$$

Organic Chemistry Topic 1

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