(a) Consider the following reaction sequence.

(i) What process leads/tathe formation of K?

(ii) Write the formula of K.

(iii) Write the structural formula of L and name L.

(iv) Name A\(_n\)

(v) Write the structure of M and name M.

 

(b)(i) What are carbohydrates?

(ii) Give one example each of a I. monosaccharide; II. disaccharide; III. polysaccharide.

 

(c) Consider the following structure of a simple sugar :

(i) Which functional group makes the compound a reducing agent?

(ii) State what would C = O be observed when I. the compound is mixed with Fehling's solution and boiled;

I. few drops of concentrated H\(_2\)SO\(_4\) is added to the sample of the compound. H—C—OH

(iii) Write an equation for the reaction in (c)(ii)(II).

 

(d) A hydrocarbon Z with molecular mass 78 on combustion gave 3.385 g of CO\(_2\) and and 0.692 g of H\(_2\)O. Determine the molecular formula of Z. [ H = 1, C = 12, O = 16]

 

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Mezalabo
2 years ago

mass of hydrogen in Z = 2 x 0.692/18 = 0.077g


mass of carbon in Z = 12 x 3.385/44 = 0.923g


C H
0.923 0.077
12 1

0.077 0.077

0.077 0.077
0.077 0.077

1 1

Empirical formula of Z = CH.

(CH)n = 78
13n = 78
n = 78 = 6
13
Molecular formula of Z = C6H6

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