In an octahedral structure, the pair of d orbitals involved in d²sp³-hybridisation is:

1. $d_{x^2-y^2},<mspace\; width="1em"></mspace>d_{z^2}$

2. $d_{xy},<mspace\; width="1em"></mspace>d_{x^2\mathit{-}{y}^{\mathit{2}}}$

3. $d_{{\mathrm{z}}^2},<mspace\; width="1em"></mspace>d_{xz}$

4. $d_{xy},<mspace\; width="1em"></mspace>d_{yz}$

AsF₅ molecule is trigonal bipyramidal. The hybrid orbitals used by As-atoms for bonding are

1. $d_{x^2-y^2},<mspace\; width="1em"></mspace>d_{z^2},<mspace\; width="1em"></mspace>s,<mspace\; width="1em"></mspace>p_x,<mspace\; width="1em"></mspace>p_y$

2. $d_{xy},<mspace\; width="1em"></mspace>s,p_x,<mspace\; width="1em"></mspace>p_y,<mspace\; width="1em"></mspace>p_z$

3. $s,<mspace\; width="1em"></mspace>p_x,<mspace\; width="1em"></mspace>p_y,<mspace\; width="1em"></mspace>p_z,<mspace\; width="1em"></mspace>d_{xy}$

4. $d_{z^2},<mspace\; width="1em"></mspace>s,<mspace\; width="1em"></mspace>p_x,<mspace\; width="1em"></mspace>p_y,<mspace\; width="1em"></mspace>p_z$

The number of sigma bonds in P₄O₁₀ is 

1. 6

2. 16

3. 20

4. 7

Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

1. Cl₂ > Br₂ > F₂ > I₂

2. Br₂ > I₂ > F₂ > Cl₂

3. F₂ > Cl₂ > Br₂ > I₂

4. I₂ > Br₂ > Cl₂ > F₂

Which one of the following molecules contain no $\mathrm{\pi }$ -bond?

1. CO₂

2. H₂O

3. SO₂

4. NO₂

The correct order of increasing bond length of 

C-H, C-O, C-C and C=C is:

1. C-C<C=C<C-O<C-H

2. C-O<C-H<C-C<C=C

3. C-H<C-O<C-C<C=C

4. C-H<C=C<C-O<C-C

The tendency of BF₃, BCl₃, and BBr₃ to behave as Lewis acid decreases in the sequence

1. BCl₃ > BF₃ > BBr₃

2. BBr₃ > BCI₃ > BF₃

3. BBr₃ > BF₃ > BCl₃

4. BF₃ > BCl₃ > BBr₃

The correct statement about carbene $\left(C{H}_2\right)$ is:

(1) In singlet carbene, carbon is $s{p}_2$-hybridized whereas in triplet carbene, carbon is sp-hybridized

(2) Triplet carbene is less stable than singlet carbene

(3) Stability of halocarbenes is: CHF>CHCL>CHBr

(4) None of the above

In which molecule does the chlorine atom has positive partial charge? 

(1) HCl

(2) BrCl 

(3) $OC{l}_2$

(4) $SC{l}_2$

The geometry with respect to the central atom of the following molecules are:

$\mathrm{N}({\mathrm{SiH}}_3{)}_3;<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>{\mathrm{Me}}_3\mathrm{N};<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>({\mathrm{SiH}}_3{)}_3<mspace\; width="1em"></mspace>\mathrm{P}$

(1) planar, pyramidal, planar

(2) planar, pyramidal, pyramidal 

(3) pyramidal, pyramidal, pyramidal

(4) pyramidal, planer, pyramidal