Draw an Alkane with the molecular formula C4H8 as well as a possible functional group isomer and state a chemical test you can use to differentiate between the two.

Many organic molecules follow specific formulas to help identify them. For Alkanes this is: CnH2n+2 (n being the total number of carbon atoms). However, this is not the case with the given molecular formula and so it is useful here to remember that the number of covalent bonds an atom has is often equivalent to 18 - x (where x is the number of the group to which the element in question belongs). For Carbon this comes to 18 - 14 = 4 bonds. Using this information we can go about drawing the molecule as usual and since there are 2 carbons that don’t have four bonds as a chain alkane we bond these carbons together to give Cyclobutane.   Functional group isomers refer to compounds with the same molecular formula but different functional groups that change the molecules chemistry. It is an example of structural isomerism. In this case given the formula we can deduce the isomer to be an Alkene. These are differentiated from Alkanes using Bromine which Alkenes attack to form Halo-Alkanes thereby decolourising bromine from brownish-orange to colourless.

Answered by Shahaab N. Chemistry tutor

9459 Views

See similar Chemistry A Level tutors

Related Chemistry A Level answers

All answers ▸

Describe and explain the trend in reactivity of Group 2 elements with chlorine as the group is descended?


How would you name complex organic compounds?


If you could give your best revision tip for exam preparation what would it be?


In an experiment a burrette was identified as the largest source of uncertainty, how could this uncertainty be reduced?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences