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NEET CHEMISTRYHydrocarbonsMedium

Question

Phenylacetylene undergoes a reaction with dilute H2SO4\text{H}_2\text{SO}_4 in the presence of HgSO4\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)

Step-by-Step Solution

Alkynes react with water in the presence of dilute sulphuric acid and mercuric sulphate at 333 K333\text{ K} to undergo a hydration reaction . The addition of water across the triple bond follows Markovnikov's rule. For phenylacetylene (C6H5-C≡CH\text{C}_6\text{H}_5\text{-C}\equiv\text{CH}), this hydration initially yields an unstable enol intermediate (C6H5-C(OH)=CH2\text{C}_6\text{H}_5\text{-C(OH)=CH}_2), which rapidly undergoes tautomerisation to form the more stable ketone product, acetophenone (C6H5COCH3\text{C}_6\text{H}_5\text{COCH}_3).

Note: The specific chemical structures for the options were missing from the input data. Option 1 is marked correct based on the provided probable answer.

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.

CHEMISTRYHydrocarbonsphenylacetyleneundergoesreactiondilutetexthtextso

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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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A.X = 2–Butyne; Y = 3–Hexyne
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A.(a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)
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A.$60^{\circ}$
B.$0^{\circ}$
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A.0
B.1
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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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A.(a) > (c) > (e) > (d) > (b)
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