Q2 of 33 Page 224

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

Diamond is the hardest allotrope of carbon because:

a) In diamond, each carbon atom is covalently bonded to four other carbon atoms in a tetrahedral way.


b) This leads to a tetrahedral three dimensional structure.


c) Three dimensional structure of diamond is:



d) The above reason is responsible for its hardness.


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10

Assertion: Denaturation of ethyl alcohol makes it unfit for drinking purpose.

Reason: Denaturation of ethyl alcohol is carried out by pyridine.


Check whether the reason is correct for assertion.


 1

Write down the possible isomers and give their IUPAC names using the formula C4H10.

 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.


 4

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.