Answer: A molecule having a covalent bond may be polar or nonpolar.
Explanation: Covalent bond is formed by sharing of electrons and ionic bond is formed by transfer of electrons.
Thus ionic molecules are always polar as they are formed by combination of positively charged ions called cations formed by less electronegative metals and negatively charged ions called anions formed by more electronegative nonmetals.
Covalent molecules which are formed by same elements have no difference in electronegativities are non polar but those formed by different elements having difference in electronegativities are polar.
For eg: Covalent molecule is non polar but covalent molecule
is polar.
Answer:
D) sodium t-butoxide + bromomethane
Explanation:
The alkoxide ion is a strong nucleophile, that unlike alcohols, will react with primary alkyl halides to form ether. This general reaction is known as <em>the Williamson synthesis</em>, and is a SN₂ displacement. The alkyl halide must be primary so the back side attack is not hindered, and the alkoxide ion must be formed with the most hindered group.
The mechanism can be seen in the attachment.
