Chemistry Expert Q&A

Choose the correct hybridization for the atom indicated in the molecule below.
(CH₃) ₂CHCN
↑

A) sp
B) sp²
C) sp³
D) none of the above

Choose the correct hybridization for the atom indicated in the molecule below.

A) sp
B) sp²
C) sp³
D) none of the above

Choose the correct hybridization for the atom indicated in the molecule below.
(CH₃) ₂CHCN
↑

A) sp
B) sp²
C) sp³
D) none of the above

A molecule of acetylene (C₂H₂) has a ________ geometry and a molecular dipole moment that is ________.

A) tetrahedral; nonzero
B) bent; nonzero
C) bent; zero
D) linear; nonzero
E) linear; zero

Acrylonitrile (CH₂=CHCN) contains ________ σ bonds and ________ π bonds.

A) 4; 1
B) 6; 3
C) 4; 3
D) 6; 1
E) 2; 0

If a compound, C₅H₇NO, contains 1 ring, how many pi bonds are there in this compound?

A) 0
B) 1
C) 2
D) 3

Which of the following statements about π molecular orbitals is/are correct?

A) π molecular orbitals are cylindrically symmetric.
B) Most of the electron density in a π molecular orbital is centered above and below the internuclear axis.
C) When two atoms are connected by a double bond, both of these bonds are π bonds.
D) Both statements B and C are correct.
E) Statements A, B, and C are all correct.

How many π bonds are present in the molecule shown?

A) 0
B) 1
C) 2
D) 4
E) 6

What is the approximate CCC bond angle in the compound below?

A) 60°
B) 90°
C) 109.5°
D) 120°
E) 180°

Choose the correct hybridization for the atom indicated in the molecule below.
CH₃CH₂CH₂CH₃
↑

A) sp
B) sp²
C) sp³
D) none of the above

A linkage of two anomeric carbons is found in ________.

A) cellobiose
B) sucrose
C) gentiobiose
D) amylose
E) chitin

Consider the interaction of two hydrogen 1s atomic orbitals of the same phase. Which of the statements below is an incorrect description of this interaction?

A) A sigma bonding molecular orbital is formed.
B) The molecular orbital formed is lower in energy than a hydrogen 1s atomic orbital.
C) The molecular orbital formed has a node between the atoms.
D) The molecular orbital formed is cylindrically symmetric.
E) A maximum of two electrons may occupy the molecular orbital formed.

Which atomic orbital combination would result in a molecular sigma bond?

A)
B)
C)
D)

Cellulose and amylose are ________.

A) 1,4' linked polymers of D-glucose which differ in the stereochemistry of this linkage
B) 1,6' linked polymers of D-glucose which differ in the stereochemistry of this linkage
C) polymers of D-glucose which are structurally isomeric
D) polymers of D-galactose which are structurally isomeric
E) synonyms for the only polymeric form of D-glucose

Cellobiose is composed of D-glucose units linked by ________.

A) β-1,6' glycosidic bonds
B) 1,1' glycosidic bonds
C) α-1,6' glycosidic bonds
D) α-1,4' glycosidic bonds
E) β-1,4' glycosidic bonds

When D-(+) -xylose is treated with nitric acid, which of the following results?

A) a racemic mixture of aldaric acids
B) an optically active aldaric acid
C) an optically inactive aldaric acid
D) an optically active aldonic acid
E) an optically inactive aldonic acid

Sucrose is hydrolyzed to what two monosaccharides?

A) glucose and fructose
B) glucose and galactose
C) maltose and fructose
D) galactose and lactose
E) galactose and maltose

An aglycone is a group bound to ________.

A) the oxygen of C6 in a glycoside
B) the anomeric carbon in a glycoside
C) a pyrimidine base
D) a purine base
E) a xanthate

When D-(+) -allose is treated with bromine water, which of the following results?

A) a racemic mixture of aldaric acids
B) an optically active aldaric acid
C) an optically inactive aldaric acid
D) an optically active aldonic acid
E) an optically inactive aldonic acid

When L-(+) -lyxose is treated with nitric acid, which of the following results?

A) a racemic mixture of aldaric acids
B) an optically active aldaric acid
C) an optically inactive aldaric acid
D) an optically active aldonic acid
E) an optically inactive aldonic acid