Ethyne is a member of "Alkyne" family whereas "Ethene" is from Alkene, in other words, there are "triple-bond" between carbon molecules in ethyne but only double-bond in ethene
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When a high amount of heat is supplied, the sugar melts faster than when a low amount of heat is supplied.
<h3>What is melting?</h3>
The term melting has to do with the breakdown of the bonds that hold the molecules of a substance together. Melting occurs when heat is applied continously to a body.
Now, the time taken for the sugar to melt depends on the amount of heat supplied. In other words, when a high amount of heat is supplied, the sugar melts faster than when a low amount of heat is supplied.
Learn more about melting:brainly.com/question/15873508
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Definite shape and volume
Glucose is a Monosaccharide which contains four stereocenters. Stereocenters are chiral carbons to which all the four groups attached have different masses. Glucose is also known as Diastereomer because it contains more than one configurations about the chiral centers.
Also, when two compounds containing same type of configurations about all chiral centers except one are called as Epimers. For example, in D-Glucose when the configuration at carbon number 4 is changed then the resulting compound formed is the epimer of D-glucose and is called as D-Galactose. Or, if the configuration at carbon two is changed then the epimer formed is called as D-Mannose.
Below are the structures of D-Glucose and D-Galactose which are epimers of each other due to configuration change at carbon 4.