Answer:
Option-D (Acetone is a ketone. Grignard reagents will react with acetone to make an unwanted byproduct.) is the correct answer.
Explanation:
Grignard reagents are formed by reacting alkyl halides in the presence of ether and dry atmosphere at controlled conditions. The rinsing of glassware is not suitable to be done with Acetone. This is because of the reactivity of Grignard reagents towards the carbonyl compounds.
In the scheme below it is assumed that a grignard reagent (ethyl magnesium bromide) was reacted with pentan-2-one to synthesise a tertiary alcohol (3-methylhexan-3-ol). But when the glassware is rinsed with acetone, some acetone left in glassware (like Round bottom flask) will react with the grignard reagent and will produce corresponding tertiary alcohol (2-methylbutan-2-ol in this assumption).
Answer:
The rate of heat transfer in cooler A is lower than the rate of heat transfer in cooler B and more heat energy is being transferred in cooler B than in cooler A.
Explanation:
A person packs two identical coolers for a picnic, placing twenty-four 12-ounce soft drinks and 5 pounds of ice in each. However, the drinks put into cooler A were refrigerated for several hours before they were packed in the cooler, while the drinks put into cooler B were at room temperature.
Therefore, the drinks in cooler A are at lower temperatures than those in cooler B because the drinks in cooler A have been refrigerated for several hours.
Generally when there is temperature gradient in a system, heat energy will flow from the body at high temperature to the body at low temperature until thermal equilibrium is reached.
The rate of heat transfer in cooler A is lower than the rate of heat transfer in cooler B and more heat energy is being transferred in cooler B than in cooler A. As a result, majority of the ice in cooler B has melted while there are still more ice in cooler A.
The condensation point of water is the same as its boiling point. This means that it is 100°C (212°F). Hope that helps!
Protons would be ones with the +