Classify each of the following alkyl groups as primary, secondary, or tertiary: butyl, isoprophyl, isobutyl, sec-butyl and tert-butyl.
Strategy: Draw the structure and lock at the `C` atom at the point of attachment.

Write the graphic formulae of the following alkyl groups : ethyl, n-propyl, iso-propyl, sec-butyl, t-butyl.

Write the structural formulas for each of the following groups: (i) n -butyl, (ii) isobutyl, (iii) sec -butyl, (iv) tertbutyl, (v) isopentyl (isomyl), and (vi) tert-pentyl ( t -amyl). Strategy: In n -alkyl groups, all C atoms form a continous C chain with no branching. In isoalkyl group, there is a CH_(3) -group on the next-to-end carbon in the chain. Prefixes sec and tert-indicate secondary and tertiary, respectively, i.e., the H atom is removed from 2^(@) and 3^(@)C atoms.

Which of the following alcohol is not oxidised by PCC :- (1) n-butyl alcohol (2) sec-butyl alcohol (3) iso-butyl alcohol (4) tert-butyl alcohol

Which among the following represents sec-butyl group?

Draw the structure of 4-tert-butyl-3-iodoheptane

Draw structural formula for tert butyl bromide