Question

Which of the following solvents is having its lowest Ebullioscopic constant?

Solvent	Boiling Point (K)
Chloroform	334.4
Diethyl Ether	307.8
Benzene	353.3
Carbon disulphide	319.4

Choose the correct answer from the options given below:

• A. Chloroform
• B. Diethyl Ether
• C. Benzene
• D. Carbon disulphide

Answer 1

The Correct Option is B

The ebullioscopic constant (\(k_b\)) quantifies the elevation in a solvent's boiling point upon solute addition. While primarily dependent on the solvent's characteristics, a general inverse relationship exists between a solvent's boiling point and its ebullioscopic constant: lower boiling point correlates with a lower \(k_b\). To identify the solvent with the lowest ebullioscopic constant, their boiling points will be compared.

Solvent	Boiling Point (K)
Chloroform	334.4
Diethyl Ether	307.8
Benzene	353.3
Carbon Disulphide	319.4

A review of the presented boiling points reveals:

• Chloroform: 334.4 K
• Diethyl Ether: 307.8 K
• Benzene: 353.3 K
• Carbon Disulphide: 319.4 K

Of these, Diethyl Ether exhibits the lowest boiling point at 307.8 K. Consequently, it is anticipated to possess the lowest ebullioscopic constant.

Therefore, the correct answer is Diethyl Ether.