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Question

Identify the following alkyl group from the expanded structure below:


  1. n-butyl
  2. n-pentyl
  3. neo-heptyl
  4. iso-hexyl


Solution

The correct option is B n-pentyl
The above structure is obtained by removing one H atom from Pentane molecule.
So (b) is the correct option


Theory :
Alkyl groups :
The univalent groups obtained by the removal of one H atom from molecule of alkane
CnH2n+2HCnH2n+1
Alkane               Alkyl
Atoms or groups of atoms which possess free valency are called “groups”.If there are two groups with the same molecular formula, then certain terms (prefixes) are used to differentiate them
'yl' substitutes for 'ane' in corresponding alkane
Name                   Mol.Formula
Methyl                 CH3
Ethyl                 C2H5
Propyl                 C3H7
Butyl                 C4H9
Pentyl                 C5H11
Hexyl                 C6H13
Heptyl                 C7H15
Octyl                 C8H17
Nonyl                 C9H19
Decyl                 C10H21
 

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