Question

question 1
which substance will have the highest melting point?
$\bigcirc c_{3}h_{5}cl_{3}$
$\bigcirc c_{5}h_{9}cl_{3}$
$\bigcirc chcl_{3}$
$\bigcirc c_{2}h_{3}cl_{3}$
$\bigcirc c_{4}h_{7}cl_{3}$
question 2
which substance will have the highest melting point?
$\bigcirc c_{2}h_{6}$
$\bigcirc c_{2}h_{5}oh$
$\bigcirc ch_{4}$
$ch_{2}och_{3}$

Explanation:

Question 1

For organic compounds with the same functional group (here, all have chlorine atoms), the melting point generally increases with the increase in molecular weight (number of carbon atoms). \(C_{5}H_{9}Cl_{3}\) has the most carbon atoms among the given options.

\(C_{2}H_{5}OH\) (ethanol) can form hydrogen bonds due to the -OH group. Hydrogen bonding is a stronger intermolecular force compared to the van der Waals forces in \(C_{2}H_{6}\) (ethane), \(CH_{4}\) (methane), and \(CH_{3}OCH_{3}\) (dimethyl ether). Stronger intermolecular forces lead to a higher melting point.

Answer:

\(C_{5}H_{9}Cl_{3}\)

Question 2