81. Alkynes have the general formula

1. 1. C_nH_2n

   
   
   

   2. C_nH_2n+2

   
   
   

   3. C_nH_2n-4

   
   
   

   4. C_nH_2n-2

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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82. Which of the following compounds has been given an octane number of 100 ?

1. 1. n - Hexane

   
   
   

   2. Iso - octane

   
   
   

   3. Neo - pentane

   
   
   

   4. Neo - octane

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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83. Fisher - Tropsch process is used in the manufacture of

1. 1. Ethane

   
   
   

   2. Benzene

   
   
   

   3. Synthetic petrol

   
   
   

   4. LPG

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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84. Domestic cooking gas consists of mostly

1. 1. Methane and ethane

   
   
   

   2. Liquified butane and iso -butane

   
   
   

   3. Ethylene and carbon monoxide

   
   
   

   4. Hydrogen and acetylene

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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85. In [18] - crown - 6, the number of oxygen atoms is

1. 1. 18

   
   
   

   2. 6

   
   
   

   3. 12

   
   
   

   4. 24

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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