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Standard XII
Chemistry
Formation of Enamines
37.A : ethyne...
Question
37.A : ethyne and its derivatives give white ppt with tollens reagent R: alkynes give white ppt due to Sn reaction
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Q.
Colourless salt (A) give white ppt (B) with NaOH; ppt (B) dissolves in excess of NaOH to form (C). On passing
H
2
S
gas into (C) white ppt (D) appears. (A) also gives white ppt (E) with
A
g
N
O
3
solution. What is (A)?
Q.
(A) gives white ppt (B) with NaOH, but (B) dissolves in excess of NaOH forming (C). (C) gives white ppt (D) when
H
2
S
gas is passed into it. (A) also gives white ppt (E) with
B
a
C
l
2
. (E) is insoluble in conc.
H
N
O
3
. Identify (A), (B), (C), (D) and (E).
Q.
(A) (colourless solution) gives white ppt (B) with NaOH solution but ppt dissolves in excess of NaOH forming (C). (C) does not give ppt with
H
2
S
but on boiling with
N
H
4
C
l
, white ppt (B) appears. (A) also gives yellow ppt with
A
g
N
O
3
.
State True or False.
(A) is
A
l
B
r
3
:
Q.
Reaction of bromine water with phenol gives white ppt of:
Q.
White ppt. of silver gives brown ppt. on boiling, but when it is heated
(
>
300
∘
C
)
, then a metallic black ppt. is obtained. Identify the compound of silver having white ppt
:
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