(f) Ethanoyl chloride (CH, COCI) reacts with benzene. According to the equation below to give phenyl ethanone (acetophenone). CH, HCI CH,C CI (i) Identify the reagent Y and give the condition for the reaction. Reagent Y:. Conditions... (ii) Explain why the reagent must be used dry? (iii) What substance(s) would be obtained when phenylethanone (acetophernone) reacts with: A: NAOH/I, B: 2,4-dinitropheny!hydrazine. C: Hydrogen cyanide gas.. (iv) If 2 g of ethanoyl chloride were used and 1.95 g of phenyiethanone obtained (RAM: CI= 35.5; C = 12; O = 16) Calculate: A: The theoretical yield. B: The percentage yield..

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Question f(iv)

A compound X of molecular mass 103 contains carbon, hydrogen, nitrogen and oxygen only. On
analysis it is found to contain 46.6 % carbon, 8.74 % hydrogen, 13.6 %, nitrogen and 31.1 %
oxygen.
(R.A.M
(a) Calculate:
(i)
7.
O= 16, C= 12, H=1.N3 14).
The empirical formula of X
(ii)The molecular formular of X.
(b) How could the presence of the nitrogen in the compound be identified. Give reagentis and
expected results only.
(c) The compound X has both an amino and a carboxylic acid functional groups and is optically
active,
(i)
(ii)
What is a functional group?...
Write the structure of the carboxylic acid functional group
(ii)
Propose the structure for X...
(d)
Draw a spread out structure of X and put an asterisk on the asymmetric carbon atom
(e)
Give reagents and observations of a simple chemical test to identify the presence of the
amino group in a compound.
(f) Ethanoyl chloride (CH, COCI) reacts with benzene. According to the equation below to give
phenyl ethanone (acetophenone).
CCH, HCI
Y
CH,C
CI
(i) Identify the reagent Y and give the condition for the reaction.
Reagent Y:.
Conditions:..
(ii) Explain why the reagent must be used dry?
(iii) What substance(s) would be obtained when phenylethanone (acetophernone) reacts
with:
А: NaOHЛ,
B: 2,4-dinitropheny!hydrazine.
C: Hydrogen cyanide gas.
(iv) If 2 g of ethanoyl chloride were used and 1.95 g of phenyiethanone obtained
(RAM: CI= 35.5; C = 12; O = 16)
Calculate:
A: The theoretical yield.
B:
The percentage yield.
Transcribed Image Text:A compound X of molecular mass 103 contains carbon, hydrogen, nitrogen and oxygen only. On analysis it is found to contain 46.6 % carbon, 8.74 % hydrogen, 13.6 %, nitrogen and 31.1 % oxygen. (R.A.M (a) Calculate: (i) 7. O= 16, C= 12, H=1.N3 14). The empirical formula of X (ii)The molecular formular of X. (b) How could the presence of the nitrogen in the compound be identified. Give reagentis and expected results only. (c) The compound X has both an amino and a carboxylic acid functional groups and is optically active, (i) (ii) What is a functional group?... Write the structure of the carboxylic acid functional group (ii) Propose the structure for X... (d) Draw a spread out structure of X and put an asterisk on the asymmetric carbon atom (e) Give reagents and observations of a simple chemical test to identify the presence of the amino group in a compound. (f) Ethanoyl chloride (CH, COCI) reacts with benzene. According to the equation below to give phenyl ethanone (acetophenone). CCH, HCI Y CH,C CI (i) Identify the reagent Y and give the condition for the reaction. Reagent Y:. Conditions:.. (ii) Explain why the reagent must be used dry? (iii) What substance(s) would be obtained when phenylethanone (acetophernone) reacts with: А: NaOHЛ, B: 2,4-dinitropheny!hydrazine. C: Hydrogen cyanide gas. (iv) If 2 g of ethanoyl chloride were used and 1.95 g of phenyiethanone obtained (RAM: CI= 35.5; C = 12; O = 16) Calculate: A: The theoretical yield. B: The percentage yield.
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