<h2>Answer 1) Option B) Temperature Change</h2><h3>Explanation : </h3>
The burning of candle is the reaction where both physical and chemical changes occurs. A physical change where the melted wax is cooled and the wax is obtained again. Whereas the chemical change takes place when the wick of the candle burns using the oxygen in the air and produces heat and light. So, this change in temperature is a chemical change as the burning process cannot be reverse, from the burnt products like soot, smoke and carbon dioxide. Therefore, the temperature change is the evidence of a chemical change in the burning of candle.
<h2>Answer 2) Option B) It is a chemical change because heat energy is absorbed and the pack gets colder.</h2><h3>Explanation :</h3>
When Clara is mixing the vial contents the ice pack gets colder. On application of the ice pack on the injured area absorbs the heat from that region and becomes more colder. This happens because in the ice pack was the medium for the temperature change that was occurring. This temperature change by absorbing heat getting colder is the evidence of a chemical change.
Hexanoyl Chloride on treatment with excess Ethyl Magnesium Bromide yields tertiary Alcohol. In this reaction Hexanoyl chloride is first converted into intermediate ketone (Octane-3-one), secondly the ketone formed is further reduced to <em>tert.</em> Alcohol (3-Ethyloctan-3-ol), The reaction along with mechanism is shown below,
