Select the correct option based on statements below:

Assertion (A):	Both rhombic and monoclinic sulphur exist as S8 but oxygen exists as O2.
Reason (R):	Oxygen forms  pπ   -   pπ multiple bonds due to its small size and small bond length but  pπ   -   pπ bonding is not possible in sulphur.

    

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	Both (A) and (R) are False.

Given below are two statements: 

Match the items in Columns I and II and mark the correct option.

Codes:

In solid-state, PCl₅ exists as: 

Which of the following is incorrect regarding noble gases?

1. The atomic radii corresponds to van der Waal’s radii.

2. They have the largest size in a period.

3. They are also called inert gases.

4. They combine to form molecules.

XeF₄ is isostructural with :

1. ${\mathrm{ICl}}_4^{-}$       

2. ${\mathrm{IBr}}_2^{-}$                   

3. ${\mathrm{BrO}}_3^{-}$

4. ${\mathrm{ICl}}_3^{-}$

Arrange the following compounds in increasing order of their acidity:
HF, HCl, HBr, HI 

1. HCl < HBr < HI<HF  

2. HF < HCl < HI< HBr

3. HF < HCl < HBr < HI

4. HF< HBr < HI< HCl