Explain why a diazonium group on a benzene ring cannot be used to direct an incoming substituent to the meta position. a. Cold temperature is necessary to keep the benzene diazonium ion from decomposing.
b. A deactivated benzene ring would be too unreactive.
c. Diazonium ion is electron donating, it is an ortho-para directant.
d. Diazonium ion is electron withdrawing, it deactivates the benzene ring.
e. Diazonium ion is highly prone to electrophilic addition.
f. Diazonium group causes steric difficulties.

Which statement describes the appearance of a temperature-vs.-time graph? a horizontal line shows that the temperature increases at a constant rate over time. a vertical line shows that the temperature decreases at a constant rate over time. horizontal lines where the temperature is constant during phase changes connect upward-sloping lines where the temperature increases. horizontal lines where the temperature increases are connected by upward-sloping lines where the temperature is constant for each phase.

Which of the following is true for the actual yield of a reaction? it is always calculated as a ratio. it is the yield from the excess reactant. it is the yield from the limiting reactant. it is always less than the theoretical yield.

Stage in which a star’s outer layers have started to cool and grow outward?