P has two lone pairs of electrons on the central atom.

Q has a perfect octahedral geometry.

Q can act as a fluorinating agent.

The molecular structure of R is trigonal pyramidal.

Second ionization enthalpy of carbon atom is less than that of boron atom.

Increasing order of ionic radii: Al³⁺ < Mg²⁺ < Na⁺

Under identical conditions, in solid state, the density of potassium metal is more than density of sodium metal.

The H–H bond is weaker than F–F bond.

Q on treatment with ethanol generates an aromatic aldehyde.

S gives positive phthalein dye test.

P is a dinitro compound.

T is a coloured compound.