Question

IUPAC name of isoamylene is 

(a) 1-pentene 

(b) 2-methylbut-1-ene 

(c) 3-methyl-1-butene 

(d) 2-methylbut-2-ene

Answer 1

Correct option is (b) 2-methylbut-1-ene 

Isoamylene has (CH₃)₂CH-type of grouping, with a total of five carbon atoms and a double bond at C₁.

\(CH_3 - \underset {\underset {CH_3}{|}}{C}H - CH = CH _2\)

Thus it should be 3-methylbut-1-ene