IIT-JEE 2007 · Paper 2 · Chemistry Q43

ChemistryMatrix match+6Question 43 of 66

Match the compounds/ions in Column I with their properties/reactions in Column II. Indicate your answer by darkening the appropriate bubbles of the 4 × 4 matrix given in the ORS.

Column I

A
$\ce{C6H5CHO}$
B
$\ce{CH3C#CH}$
C
$\ce{CN-}$
D
$\ce{I-}$

Column II

P
gives precipitate with 2,4-dinitrophenylhydrazine
Q
gives precipitate with $\ce{AgNO3}$
R
is a nucleophile
S
is involved in cyanohydrin formation

Answer and worked solution

Official answer: A → P, S; B → Q; C → Q, R, S; D → Q, R

A, benzaldehyde: a carbonyl compound, so it gives a 2,4-DNP derivative and adds HCN to form a cyanohydrin. → P, S.
B, propyne: a terminal alkyne; its acidic H gives a silver acetylide precipitate with (ammoniacal) $\ce{AgNO3}$ . → Q.
C, $\ce{CN-}$ : precipitates AgCN, is a nucleophile, and is the attacking species in cyanohydrin formation. → Q, R, S.
D, $\ce{I-}$ : precipitates yellow AgI and is a good nucleophile. → Q, R.

Answer: A → P, S; B → Q; C → Q, R, S; D → Q, R

Topics:Nucleophilic addition Alkynes Anion analysis

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IIT-JEE 2007 · Paper 2, Chemistry question 43