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Question

Match the compounds in Column I with their characteristics/tests/reactions given in Column II.

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Solution

Note: It does not give test for N, i.e., sodium fusion extract of the compound (Lassaigne's test). Only the compounds containing C and N give Lassaigne's test. It does not contain C, so its Lassaigne extract with FeSO4 and FeCl3 does not give prussian colour.

(bp,q)
i. Since (b) contains both C and N, it gives test for N.
C+N+NaNaCN
6CN+Fe2+[Fe(CN)6]44Fe3+Fe4[Fe(CN)6]3Ferriferrocyanide
ii. Phenolic compound gives violet or red colouration with FeCl3.
ii. (b) contains I ion, so it gives yellow-white precipitate (AgI) with AgNO3.
(cp,q,r)
i. (c) also contains C and N and gives test for N as shown above in (b).
ii. (c) is phenolic compound; it also gives colour with FeCl3.
iii. (c) contains Cl ion, so it gives white ppt. (AgCl) with AgNO3.
(dp,s)
i. (d) also contains C and N and gives test for N as shown above in (b).
ii.It is hydrobromide salt of 2,4-DNP, so it reacts with aldehyde to form 2,4-DNP derivative.
iii. (d) contains Br ion, so it gives pale yellow precipitate (AgBr) with AgNO3.

1788306_1769984_ans_c41d6b8e52f94264ad8dd7da32c8f243.png

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