Question 1

Which type of bond is present between carbon and oxygen atoms in $$CO_2$$?

Accepted Answer

Polar covalent

Question 2

Does $$CO_2$$ bear a molecular dipole? Explain why.

Accepted Answer

No, because the dipoles cancel due to the linear geometry.

Question 3

Given the electronegativity values $$C = 2.6$$ and $$O = 3.5$$, what is the difference in electronegativity for a C-O bond, and what type of bond does this indicate?

Accepted Answer

$$0.9$$, indicating a polar covalent bond

Question 4

Carbon tetrachloride ($$CCl_4) $$carries which type of molecular dipole?

Accepted Answer

No molecular dipole

Question 5

Which step is NOT part of the standard procedure for drawing a Lewis structure?

Accepted Answer

Arrange the atoms with the most electronegative in the center

Question 6

Formaldehyde ($$H_2CO) is $$polar because:

Accepted Answer

The bond dipoles do not cancel due to its trigonal planar geometry

Question 7

Which molecule is an exception to the octet rule and is stable with only 6 valence electrons?

Accepted Answer

Boron trifluoride ($$BF_3)$$

Question 8

Which element can expand its valence shell to accommodate more than 8 electrons?

Accepted Answer

Phosphorus

Question 9

In bond-line notation, how many carbon atoms are present in a zig-zag line with 5 vertices?

Accepted Answer

5

Question 10

Which functional group is present in phenol?

Accepted Answer

Aromatic ring with hydroxyl group

Question 11

What is the correct Lewis structure for $$CO_3$$^{2-}$$ (carbonate ion) regarding formal charges?

Accepted Answer

Two oxygens with -1 charge each, one neutral

Question 12

Which of the following is a correct statement about functional groups?

Accepted Answer

Molecules with the same functional group have similar properties

Question 13

Which functional group is present in acetone?

Accepted Answer

Ketone

Question 14

Which of the following molecules contains a carboxylic acid functional group?

Accepted Answer

Acetic acid

Question 15

What is the bond angle around a carbon atom with $$sp^2$$ hybridization?

Accepted Answer

$$120^	ext{o}$$

Question 16

Which of the following is true about the molecular geometry of $$CH_4$$?

Accepted Answer

Tetrahedral

Question 17

Which functional group is present in the neurotransmitter dopamine?

Accepted Answer

Phenol

Question 18

Which of the following is a correct statement about bond-line notation?

Accepted Answer

Carbon atoms are represented by the ends and intersections of lines

Question 19

Which molecule would have a net molecular dipole?

Accepted Answer

$$H_2CO$$

Question 20

Which of the following is NOT a carbonyl-containing functional group?

Accepted Answer

Alcohol

Fundamentals of Covalent Bonding, Molecular Polarity, and Lewis Structures in Organic Chemistry

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