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  • (a) Draw electron dot structure of methane molecule (b) Identify the functional groups present in the following compounds

(a) Draw electron dot structure of methane molecule.

(b) Identify the functional groups present in the following compounds :

(i) C_{2}H_{6}O

(ii) C_{2}H_{4}O

(c) A mixture of oxygen and ethyne is burnt for welding. Why do you think a mixture of ethyne and air is not used for welding ?

 

 

 

 
 
 
 
 

Answers (1)

(a)

(b) (i) C_{2}H_{6}O

  • CH_{3}-CH_{2}-OH\; \rightarrow \; Functional\; group\; -OH(alcohol)
  • CH_{3}-O-CH_{3}\; \rightarrow \; Functional\; group\; -O-(ether)

    (ii) C_{2}H_{4}O

(c) Because Ethyne undergoes incomplete combustion in air and gives a sooty flame

In Oxygen, Ethane gives a clean flame with high temperature (3000^{\circ}C) because of complete combustion and it is not possible to attain such a high temperature with air.

 

Posted by

Sumit Saini

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