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WorksheetsQuestionnaire 7 Chem (12th)
Total questions: 20
Worksheet time: 13mins
Nucleophiles are
Chemical species that seek nuclei
Chemical species that seek electrons
Chemical species rich in nuclei
Electreophiles are
Chemical species that seek electrons
Chemical species that seek nuclei
Chemical species rich in electrons
Cl-1 is an example of
nucleophile
electrophile
None of the above
Cr+3 is an example of
nucleophile
electrophile
None of the above
Cations are nucleophiles and anions are electrophiles
True
False
The electron flow in chemical reactions goes
from the electron deficient species to the electron rich species
from the electron rich species to the electron deficient species
from both sides
Neutral molecules can be electrophiles and nucleophiles according to the case
True
False
A dipole is
a formal charge which indicates the gain or loss of electrons when forming a covalent bond.
an apparent charge which indicates the charge difference and points to the more negative element.
None of the above
Electronegativity is
It is the tendency of an atom to repulse electrons.
It is the tendency of an atom to attract electrons.
It is the tendency of an atom to form electrons.
Dipoles are the same as formal charges
True
False
Select the nucleophile
CH3+
HCl
I-
Select the electrophile
CH3+
Ne
Cl-
Select the nucleophile
CH3CH3
BH3
NH3
H2
Select the nucleophile
CH3+
HCl
I-
How many resonance structures does propanone have?
1
2
3
How many resonance structures does 2-butenal have?
1
2
3
Chlorine is more electronegative than Carbon
True
False
Lithium is more electronegative than Carbon
True
False
In an oxygenated functional group
the negative dipole moves towards oxygen because of its electronegativity
the negative dipole moves towards carbon because of its electronegativity
None of the above
Explain the resonance of 2-butenal
