Which of the following fluoro compounds acts as a Lewis base?

The total number of lone pairs of electrons in melamine is

Which of the following statement$(s)$ is/are correct? [$T$ for True and $F$ for False$]$
$(a)$ Hybrid orbitals form stronger bonds than pure atomic orbitals.
$(b)$ Canonical structures have a difference in the arrangement of atoms $w.r.t.$ each other.
$(c)$ Any symmetrical molecule always contains the same bond angle.
$(d)$ $VSEPR$ theory can explain the square planar geometry of $XeF_4$.

Which of the following order of given properties is incorrect?

Which of the following compounds is polar and has a central atom with $sp^2$ hybridization?

The different types of bonds present in $CuSO_4 \cdot 5 H_2 O$ are