Q4 of 33 Page 224

An organic compound (A) of molecular formula C2H6O on oxidation with alkaline KMnO4 solution gives an acid (B) with the same number of carbon atoms. Compound A is used as an antiseptic to sterilize wounds, in hospitals. Identify A and B. Write the chemical equation involved in the formation of B from A.

Given:

i. Organic compound has a molecular formula = C2H6O


ii. Used as an antiseptic to sterilize wounds.


iii. Oxidation with KMnO4 gives an acid.


As the organic compound is used as an antiseptic to sterilize wounds, it must be an ethanol.


Ethanol (A) undergoes oxidation with KMnO4 to form a carboxylic acid, i.e., ethanoic acid (B)


The reaction takes place is given below:



Thus, A is ethanol and B is ethanoic acid.


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2

Diamond is the hardest allotrope of Carbon. Give reason for its hardness.

 3

An organic compound (A) is widely used as a preservative in pickle and has a molecular formula C2H4O2. This compound reacts with ethanol to form a sweet smelling compound

(B).


(i) Identify the compounds A and B.


(ii) Name the process and write the corresponding chemical equation.


 5

C2H6O is the molecular formula for two compounds A and B. They have different structural formula.

i) What is this phenomenon known as?


ii) Give the structural formula of A and B.


iii) Write down their common and IUPAC names.


iv) Mention the functional groups of A and B.


 6

Rewrite the following choosing the correct word from each pair given in brackets:

The hydrocarbons containing at least one carbon to carbon _______________ (double/triple) bond are called __________(alkenes/alkynes).They have the general formula CnH2n.These were previously called ______________(olefins/paraffins). When this compound is treated with ____________(bromine/lime) water, decolourisation occurs because it is _____________(saturated/unsaturated).