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EEJ MAIN Chemistry QUESTION #7502
Question 1

Match the compounds in Item I with their correct detection reagents in Item II:

Item I (Compound)Item II (Reagent)
(A) Lysine(P) 1-naphthol
(B) Furfural(Q) Ninhydrin
(C) Benzyl alcohol(R) KMnO$_4$
(D) Styrene(S) Ceric ammonium nitrate
  • (A)→(Q); (B)→(P); (C)→(S); (D)→(R)✔️
  • (A)→(Q); (B)→(P); (C)→(R); (D)→(S)
  • (A)→(R); (B)→(P); (C)→(Q); (D)→(S)
  • (A)→(Q); (B)→(R); (C)→(S); (D)→(P)
Correct Answer Explanation

Matching logic:

  • Lysine is an amino acid — detected by ninhydrin (Q), which gives a purple colour with primary amines/amino acids.
  • Furfural is an aldehyde from furan — detected by 1-naphthol (P) via the Tollens-type or colour reaction specific to furfural.
  • Benzyl alcohol (PhCH$_2$OH) is a primary alcohol — detected by ceric ammonium nitrate (S), which gives a red colour with alcohols.
  • Styrene (Ph–CH=CH$_2$) has a C=C bond — oxidized by KMnO$_4$ (R), which gets decolourized.

Correct match: (A)→(Q), (B)→(P), (C)→(S), (D)→(R)