What is importance of natural gas?

 

  1. No.3. What is importance of natural gas?

Answer. Natural gas is used as fuel in homes as well as in industries. It is used as fuel in auto-mobiles as compressed natural gas (CNG). Natural gas is also used to make carbon black and fertilizer.

  1. No.4. Justify that organic compounds are used as food.

Answer. The food which we eat daily such as milk, eggs, meat, vegetables, etc., contain carbohydrates, proteins, fats, vitamins, etc. are all organic so we can say organic compounds are used as food.

  1. No.5. How alkyl radicals are formed? Explain with examples.

Answer. Alkyl radicals are derivatives of alkanes. They are formed by the removal of one of the hydrogen atom of an alkane and are represented by a letter ‘R. Their name is written by replacing ‘ane’ of alkane with ‘yl’. For example, propane has a straight chain structure.

When terminal H is removed it is called n-propyl. When hydrogen from central carbon is removed it is called isopropyl, as explained below:

 

Removal of terminal H→ CH3-CH2-CH2–     n-propyl

H

CH3―CH2―CH3                                                                                       I

Propane                                       Removal of centralH→ CH3—C―CH3      isopropyl

I

 

 

  1.                                                                                            No.6. What is the difference between n-propyl and isopropyl? Explain with structure,

Answer. Propane has a straight chain structure. When terminal H of propane is removed it is called n-propyl. When hydrogen from central carbon atom of propane is removed it is called isopropyl, as shown in formula

CH3-CH2-CH2–                                  CH3-CH-CH3

n-propyl                                  isopropyl

  1. No.7. Explain different radicals of butane.

Answer.    Butane   exists   as   n-butane   and   isobutene.    Different structures of butyl radicals are explained

Removal of terminal H→ CH3-CH2-CH2–     n-butyl

H

CH3-CH2-CH2-CH2                                                                                    │

Butane                             Removal of central H→ CH3—C― CH2―CH3      sec-butyl

                                                                                                │

                                                                                         

                                                                                                                                                     CH3

                                                                                                                                                      │

CH3                               Removal of terminal H→ CH3-CH2-CH2–     isopropyl

│                                                          H

CH3―CH2―CH3                                                                                       │

isobutane                                    Removal of central H→ CH3—C―CH3    

I

terbulyl

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