[morgan963]

Two students each make a statement about 2-methylbut-1-ene.
Student 1 states that 2-methylbut-1-ene has geometrical isomers.
Student 2 states that 2-methylbut-1-ene reacts with HBr in an addition reaction to give
1-bromo-2-methylbutane as the main product.
Which students are correct?
A both 1 and 2
B 1 only
C 2 only
D neither 1 nor 2

i dont understand how can i know when a compund have geomtrical isomer or not and why HBr cant make addition reaction when there is double bond in this structure

[mjc123]

Draw out the structure and see. Do you know what geometrical isomers are?

HBr can make an addition reaction, but is student 2 right about the main product?