A person with a body temperature of 37°C holds an ice cube with a temperature of 0°C in a room where the air temperature is 20.°
C. The direction of heat flow is (1) from the person to the ice, only
(2) from the person to the ice and air, and from the air to the ice
(3) from the ice to the person, only
(4) from the ice to the person and air, and from the air to the person
The answer is (2). Heat always flows down the temperature gradient, from high temperature to low temperature. Therefore, since the person is the warmest, heat flows from the person to both the ice and the air. Additionally, since the air is warmer than the ice, heat flows from the air to the ice.
Most substituted alkene is produced as a major product
Explanation:
Dehydration of 3-methyl-2-butanol proceeds through E1 mechanism to form alkenes.
Most substituted alkene is produced as major product because of presence of highest number of hyperconjugative hydrogen atoms corresponding to the produced double bond (Saytzeff product).
Here, a H-shift also occurs in one of the intermediate step during dehydration to produce more stable tertiary carbocation.
