NEET 2023 | Some Basic Concepts of Organic Chemistry Question 15 | Chemistry

NEET 2023

MCQ (Single Correct Answer)

-1

In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with $$\mathrm{Fe}^{3+}$$ due to the formation of-

NaSCN

$$\left[\mathrm{Fe}(\mathrm{CN})_{5} \mathrm{NOS}\right]^{4-}$$

$$[\mathrm{Fe}(\mathrm{SCN})]^{2+}$$

$$\mathrm{Fe}_{4}\left[\mathrm{Fe}\left(\mathrm{CN}_{6}\right)\right]_{3} \cdot \mathrm{xH}_{2} \mathrm{O}$$

NEET 2023

MCQ (Single Correct Answer)

-1

Amongst the given options which of the following molecules/ion acts as a Lewis acid?

$$\mathrm{H}_{2} \mathrm{O}$$

$$\mathrm{BF}_{3}$$

$$\mathrm{OH}^{-}$$

$$\mathrm{NH}_{3}$$

NEET 2023

MCQ (Single Correct Answer)

-1

Consider the following compounds/species:

NEET 2023 Chemistry - Some Basic Concepts of Organic Chemistry Question 15 English

The number of compounds/species which obey Huckel's rule is ___________.

NEET 2022 Phase 2

MCQ (Single Correct Answer)

-1

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Chlorine is an electron withdrawing group but it is ortho, para directing in electrophilic aromatic substitution.

Reason (R) : Inductive effect of chlorine destabilises the intermediate carbocation formed during the electrophilic substitution, however due to the more pronounced resonance effect, the halogen stabilises the carbocation at ortho and para positioins.

In the light of the above statements, choose the most appropriate answer from the options given below :

(A) is not correct but (R) is correct

Both (A) and (R) are correct and (R) is the correct explanation of (A)

Both (A) and (R) are correct but (R) is not the correct explanation of (A)

(A) is correct but (R) is not correct

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