Among the gases (a) – (e), the gases that cause greenhouse effect are :
(a) CO₂
(b) H₂O
(c) CFCs
(d) O₂
(e) O₃

Arrange the following compounds in increasing order of C–OH bond length :
methanol, phenol, p-ethoxyphenol

A graph of vapour pressure and temperature for three different liquids X, Y, and Z is shown below : The following inferences are made :
(A) X has higher intermolecular interactions compared to Y.
(B) X has lower intermolecular interactions compared to Y.
(C) Z has lower intermolecular interactions compared to Y.
The correct inference (s) is / are :

The third ionization enthalpy is minimum for :