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NEET CHEMISTRYHydrocarbonsMedium

Question

P, Q and R in the above-mentioned sequence of reactions are respectively:

A

(Option 1 Structure Missing)

B

(Option 2 Structure Missing)

C

4

D

(Option 4 Structure Missing)

Step-by-Step Solution

  1. Missing Data: The specific reaction sequence involving reagents and the starting material to form P, Q, and R is missing from the input. In organic chemistry, the identity of products depends entirely on the specific reagents (e.g., oxidation, reduction, substitution) applied to the substrate.
  2. General Context (Benzene Reactions): Based on the tags (NEET 2018, Aromatic Hydrocarbons), the question likely involves standard reactions of benzene such as:
  • Electrophilic Substitution: Nitration, Halogenation, Friedel-Crafts Alkylation/Acylation [NCERT 11th, Ch 13, Sec 13.5.5].
  • Directive Influence: Identifying ortho/para or meta products based on substituents [NCERT 11th, Ch 13, Sec 13.5.6].
  • Preparation: From alkynes (cyclic polymerisation) or decarboxylation of aromatic acids [NCERT 11th, Ch 13, Sec 13.5.4].
  1. Conclusion: Without the reaction scheme, the chemical identity of P, Q, and R cannot be determined. The 'Probable Answer' is Option 4, but this cannot be verified.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Hydrocarbons. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYHydrocarbonsabovementionedsequencereactionsrespectively

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Phenylacetylene undergoes a reaction with dilute $\text{H}_2\text{SO}_4$ in the presence of $\text{HgSO}_4$ to yield:

A.Option 1 (Structure missing)
B.Option 2 (Structure missing)
C.Option 3 (Structure missing)
D.Option 4 (Structure missing)
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The reaction among the following that proceeds through an electrophilic substitution reaction is:

A.(Option 1 Structure Missing)
B.(Option 2 Structure Missing)
C.4
D.(Option 4 Structure Missing)
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A.(i) > (ii) > (iii) > (iv)
B.(ii) > (iv) > (i) > (iii)
C.(iv) > (iii) > (ii) > (i)
D.(iv) > (ii) > (i) > (iii)
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X and Y in the above-mentioned reaction are respectively:

A.X = 2–Butyne; Y = 3–Hexyne
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Match the bond line structures of hydrocarbons given in List-I with the corresponding boiling points given in List-II. List-II (Boiling point in K): (i) 300.9 (ii) 282.5 (iii) 309.1 (iv) 341.9 Choose the correct answer from the options given below:

A.(a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)
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A.$60^{\circ}$
B.$0^{\circ}$
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The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is:

A.The eclipsed conformation of ethane is more stable than staggered conformation because eclipsed conformation has no torsional strain.
B.The eclipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has a torsional strain.
C.The staggered conformation of ethane is more stable than eclipsed conformation because staggered conformation has no torsional strain.
D.The staggered conformation of ethane is less stable than eclipsed conformation because staggered conformation has a torsional strain.
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