Question

What are the differences between sectional interest group and public interest groups?

Answer 1

Usually sectional groups represent a section of the society.
Their principal is concern in the betterment and well being of their members, not society in general. For example FEDCOR in Bolivia

Public interest groups promote collective rather than selective good. 
They aim to help groups other than their own members.
For example BAMCEF

Answer 2

$</p><p>\huge{\pink{\boxed{\boxed{\gray{\ulcorner{\mid{\overline{\underline{\bf{Answer:-}}}}}}\mid}}}}$Sectional interest groups promote the interests of a particular section or group of society e.g., professional body of lawyers, doctors. Public interest groups promote collective rather than selective good. Their aim is to help groups other than own members e.g., BAMCEF (Backward and Minorities Community Employees Federation).