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A compound C8 H6 decolorizes Br2 in CCl4 and gives a white precipitate with Tollen’s reagent. It has sharp band at 3300 cm-l and weak bands at 3085, 2110 cm-l. What is this compound?
  • a)
    Phenyl acetylene
  • b)
    Phenyl propylene
  • c)
    Phenyl ethylene
  • d)
    Octene
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
A compound C8 H6 decolorizes Br2 in CCl4 and gives a white precipitate...
The compound C8H6 is likely an aromatic compound, as it contains a benzene ring with additional substituents. The reaction with Br2 in CCl4 indicates that the compound is capable of undergoing addition reactions. The decolorization of Br2 suggests that the compound is an electron-rich system, which is able to donate electrons to react with the bromine.

The white precipitate formed with Tollen's reagent (ammoniacal silver nitrate) suggests that the compound contains an aldehyde functional group. Tollen's reagent is used to test for the presence of aldehydes, which can be oxidized to carboxylic acids by the silver ions in the reagent. The oxidation of the aldehyde produces a white precipitate of silver metal.

Based on these observations, the compound C8H6 is likely an aromatic aldehyde. One possible structure could be benzaldehyde (C6H5CHO), which contains a benzene ring with an aldehyde group attached.
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A compound C8 H6 decolorizes Br2 in CCl4 and gives a white precipitate...
C8 H6 → Sharp band at 3300 cm-l
Weak band at 3085, 2110 cm-l
Double bond equivalent = C + 1 – H⁄2 – X⁄2 + N⁄2,
(where C→ Carbon, H→ Hydrogen, X→ Halogen, N→ Nitrogen)
= 8 + 1 – 6⁄2 = 6.
One double bond equivalent represents either one bond or one ring.
Now, band at 3300 shows C–H bond, 2110 may be because of C≡C triple bond
Now, we check each option one by one
Option Octene → octene → does not match m.f. C8 H6.


C ≡ C → 2110
D.B.E. → 5πbond
M.f. → C8 H6. Hence, the correct option is Phenyl acetylene.
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A compound C8 H6 decolorizes Br2 in CCl4 and gives a white precipitate with Tollen’s reagent. It has sharp band at 3300 cm-l and weak bands at 3085, 2110 cm-l. What is this compound?a)Phenyl acetyleneb)Phenyl propylenec)Phenyl ethylened)OcteneCorrect answer is option 'A'. Can you explain this answer?
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A compound C8 H6 decolorizes Br2 in CCl4 and gives a white precipitate with Tollen’s reagent. It has sharp band at 3300 cm-l and weak bands at 3085, 2110 cm-l. What is this compound?a)Phenyl acetyleneb)Phenyl propylenec)Phenyl ethylened)OcteneCorrect answer is option 'A'. Can you explain this answer? for Chemistry 2024 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about A compound C8 H6 decolorizes Br2 in CCl4 and gives a white precipitate with Tollen’s reagent. It has sharp band at 3300 cm-l and weak bands at 3085, 2110 cm-l. What is this compound?a)Phenyl acetyleneb)Phenyl propylenec)Phenyl ethylened)OcteneCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Chemistry 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A compound C8 H6 decolorizes Br2 in CCl4 and gives a white precipitate with Tollen’s reagent. It has sharp band at 3300 cm-l and weak bands at 3085, 2110 cm-l. What is this compound?a)Phenyl acetyleneb)Phenyl propylenec)Phenyl ethylened)OcteneCorrect answer is option 'A'. Can you explain this answer?.
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