Questionnaire 7 Chem (12th)

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