Ncert Exercises & Solutions

Select the correct option based on statements below:

Assertion (A):	SF₆ cannot be hydrolysed but SF₄ can be.
Reason (R):	Six F-atoms in SF₆ prevent the attack of H₂O on sulphur atom of SF₆

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.	(A) is false but (R) is true.

HINT: Steric hindrance in the case of SF₆

$Explanation:$

$STEP 1:$

SF

4 is see -saw in shape while SF 6 is octahedral in shape.

$STEP 2:$

S F_{6}

is not easily hydrolysis because here S atom is surrounded by 6F atom so it's complected for

H_{2} O

to attack

S F_{6}

but in

case of

S F_{4}

here S atom is surrounded by 4F atom so it's to attack by

H_{2} O .

Hence, Assertion and reason both are true and

the reason is the correct explanation of assertion.