Question

1. a series of substances have the same chemical formula (c28h44o, 396.648 g/mol), but different bonding (i.e., they are isomers). experimentally, the melting point was determined for each in the table below. from this information, infer which compound has the most intermolecular forces as a solid.

a) ergosterol
b) pyrocalciferol
c) lumisterol
d) suprasterol ii
e) vitamin d2

compound	melting point (°c)
pyrocalciferol	94
lumisterol	118
suprasterol ii	110
vitamin d2	117

Explanation:

Step1: Understand the relationship

Higher melting - point indicates stronger intermolecular forces.

Step2: Compare melting points

Ergosterol has the highest melting - point ($158^{\circ}C$) among the given compounds.

Answer:

a) Ergosterol