Reasonance and Hybridization Flashcards
Carbon-carbon double bonds consist of:
a) one σ bond, one π bond
b) two σ bond, one π bond
c) one σ bond, two π bonds
d) two σ bonds, two π bonds
a) one σ bond, one π bond
When the carbon is sp2 hybridized in a compound, it is bonded to:
a) 2 other atoms
b) 3 other atoms
c) 4 other atoms
d) 5 other atoms
b) 3 other atoms
What is the bond angle between the hybrid orbitals in methane?
a) 180 degrees
b) 120 degrees
c) 109.5 degrees
d) 115.5 degrees
109.5 degrees
the H-C-H bond in ethane angle is
a) 60
b) 120
c) 90
d) 180
b) 120
The phenomenon of forming completely new atomic orbitals by intermixing them is known as?
hybridization
In propene there are
a) 8 σ and 1 π
b) 7 σ and 2 π
c) 6 σ and 3 π
d) 9σ
a) 8 σ bonds and 1 π
What is the relationship between 1-butene and cis-2-butene?
a) unrelated compounds
b) constitutional isomers
c) enantiomers
d) diastereomer
b) constitutional isomers
Which of the following molecules exist as a pair of enantiomers?
a) 2-bromopropane
b) 1-bromo-3-methylbutane
c) 2-cyclohexene-1-ol
d) cis-1,2-dichlorocyclobutane
enantiomers are optical isomers
c) 2-cyclohexene-1-ol
Name this compound
Cl CH3
| |
CH3CHC=CHCH3
a) 2-chloro-3-methylpent-3-ene
b) 4-chloro-3-methylpent-2-ene
c) 3-methyl-4-chloropent-2-ene
d) 3-methyl-2-chloropent-3-ene
b) 4-chloro-3-methylpent-2-ene
The double has priority over the side groups
What atomic orbitals are invovled in making a C-H bond in methane?
a) A 2p orbital on C and a 1s orbital on H
b) a 2s orbital on C and a 1s orbital on H
c) An sp3 orbital on C and a 1s orbital on H
d) An sp2 orbital on C and a 1s orbital on H
c) An sp3 orbital on C and a 1s orbital on H
What is the bond angle of H-C-H in methane molecule?
a) 104.5
b) 109.5
c) 108
d) 120
b) 109.5
How many sigma bonds are in ethene?
a) 6
b) 7
c) 4
d) 5
d) 5
True or false?
The orbitals formed after hybridization have equal energy
True
Which of the following statements is true regarding hybrid orbitals?
a) The number of orbitals formed after the hybridization is not equal to the number of orbitals before hybridization
b) The hybrid orbitals don’t have equal enegry
c) They can form more stable bonds than the pure orbitals
d) Hybridization doesn’t indicate geometry
c) They can form more stable bonds than the pure orbitals
A π bond is the result of the
a) overlap of two s orbitals
b) overlap of an s and a p orbital
c) overlap of two p orbitals along their axes
d) sideways overlap of two parallel p orbitals
d) sideways overlap of two parallel p orbitals
What kind of orbitals are utilized by carbon atomin CF4
a) sp
b) sp2
c) sp3
d) sp3d
c) sp3
Which molecule has a linear arrangment of all component atoms?
a) CH4
b) H2O
c) CO2
d) NH3
c) CO2
Which of the following is not a priority rule for R, S-configuration?
a) If the four atoms attached to the chiral center are all different, priority depends on atomic number, with the atom of lower atomic numbers getting lower priority
b) If the two atoms attached the chiral center are the same, the atoms attached to each of these first atoms are compared
c) When there is a double or triple bond, both atoms are considered to be duplicated or triplicated.
d) If the four atoms attached to the chiral center are all different, priority depends on atomic number, with the atom of higher atomic numbers getting lower priority
d) If the four atoms attached to the chiral center are all different, priority depends on atomic number, with the atom of higher atomic numbers getting lower priority
Higher atomic numbers lead to a higher priority not lower
If our eyes travel in a counter clockwise direction from the ligand of highest priority to the ligand of lowest priority, the configuration is __?
a) R-configuration
b) S-configuration
c) E-configuration
d) Z-configuration
b) S-configuration
Which of the following groups has the highest priority?
a) CH3
b) CH2Cl
c) CH2OH
d) CHO
b) CH2Cl
The cis-trans nomenclature is not applicable when
a) The different groups attached to the carbon atom of the double bond are same
b) At least one of the groups attached to each of the carbon atoms is same
c) The different groups attached to the carbon atom of the double bond are not same
d) The cis-trans nomenclature is applicable for all compounds
c) The different groups attached to the carbon atom of the double bond are not same
The isomers which can be inter converted through rotation around a single bond are:
a) conformers
b) Diasteromers
c) Enantiomers
d) Positional isomers
a) conformers
Chiral molecules are thos which are:
a) Shows geometrical isomerism
b) superimposable on their mirror images
c) non-superimposable on their mirror images
d) unstable molecules
c) non-superimposable on their mirror images
Compound in which carbons use only sp3 hybridization for bond formation is
a) CH3CH2CH3
b) CH3C=CH
c) CH3CH=CH2
d) CH2=CH–CH=CH2
a) CH3CH2CH3
Which statement is true?
a) Resonance hybrids are inherently unstable
b) Resonance hybrids are more stable than any individual resonance form
c) Resonance hybrids are averages of all resonance forms resembling the less stable forms
d) Resonance hybrids are averages of all resonance forms resembling the more stable forms
d) Resonance hybrids are averages of all resonance forms resembling the more stable forms
