Question

In the case of aryl halides, halogens are moderately deactivating.
REASON
Halogens are ortho, para directing groups.
A.Both assertion and reason are correct and reason is the correct explanation for Assertion.
B.Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C.Assertion is correct but Reason is incorrect
D.Both Assertion and Reason are incorrect

Answer 1

In the given question firstly we have to define both the assertion and the reason. Now we can observe that whether any of them are false or both of them are true. Now here the assertion is absolutely correct as in the case for the aryl halides the group is deactivating and it is also the ortho and para directing in nature but nature doesn't explain it.

Complete answer: or Complete step by step answer:
Here first we have to observe both the statement and then we can get the right answer :
Statement : In case of aryl halides, halogens are moderately deactivating.
It is perhaps true that the halogens are moderately deactivating in nature. Although this is mostly due to their strong-I effect. Because of this the overall electron density is decreased on the benzene ring hereby deactivating it.

Statement : Halogens are ortho, para directing groups.
It is perhaps true that the halogens ortho, para directing groups. Due to the phenomenon of resonance and its effect, the electron density is increased on the ortho and para positions in comparison to the meta position thereby, making them ortho and para directing in nature.
This gives us the fact that though both of them are correct still the assertion is not correctly explained by the reason properly, and don’t provide the light over the nature of the halides.

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

So, the correct answer is Option B.

Note:
In the field of organic chemistry, it is said that an aryl halide (also known as haloarene or halogenoarene) is an aromatic compound. In this type of aromatic compound we have one or more hydrogen atoms directly bonded to an aromatic ring are replaced by a halide.