The correct order of H-bond strength in the following compounds is:

1. H₂O > H₂O₂ > HF > H₂S

2. HF >  H₂O₂ > H₂O > H₂S

3. HF > H₂O > H₂S > H₂O₂

4. HF > H₂O > H₂O₂ > H₂S

 A pair of species that have identical shapes is : 

1. NO₂⁺ and NO₂^-

2. PCl₅ and BrF₅

3. XeF₄ and ICI₄^-

4. TeCl₄ and XeO₄

Which of the following is correct :-

(1) Extent of hydration is PCl₅ > SiCl₄ and BCl₃ < CCl₄

(2) K⁺ ion will be more Hydrated than Li⁺

(3) In BCl₃ there are no vacant d-orbitals but still it can undergo expansion

(4) None

Carbon atom in C₂(CN)₄ are

1. sp hybridised

2. sp² hybridised

3. sp and sp² hybridised

4. sp, sp² and sp³ hybridised

The correct order in which the O-O bond length increases in the following is

1. H₂O₂ < O₂ < O₃

2. O₃ < H₂O < O₂

3. O₂ < O₃< H₂O₂

4. O₂ < H₂O₂ < O₃

Carbon suboxide (C₃O₂) has

1. Linear structure

2. Bent structure

3. Trigonal structure

4. Disorted tetrahedral structure

Among the following species, the one that has the highest bond energy is:

1. ${\mathrm{N}}_2^{+}$

2. ${\mathrm{O}}_2$

3. ${\mathrm{CO}}^{+}$

4. ${\mathrm{N}}_2$

Which of the following has largest bond angle.

1. H₂O

2. F₂O

3. Cl₂O

4. H₂S

Compound that is isoelectronic with an adduct of "Diborane and Ammonia" is:

1. Hydrogen peroxide.

2. Diborane (at absolute zero temp.).

3. First member of alkyne series.

4. Diborane (at 10$°$C temp).

The hydride of group 16 having highest boiling point is:

1. H₂O because of H-bonding

2. H₂Te because of higher molecular weight

3. H₂S because of H-bonding

4. H₂Se because of lower molecular weight