Question

draw the structrual formula for
a)ethylcyclopentene
b)5-ethyl-2,2-dimethyl-3-heptene
c)3,4-dimethylhexyne

Answer 1

This should help: http://www.chemguide.co.uk/basicorg/conventions/names.html

When doing the reverse you should start from the back of the name. Can you do that?

Answer 2

what i get for a) is a hexagon with ch2 and ch3 connected at first spot

Answer 3

or ch5

Answer 4

Ok first you know it's 5 carbons in the main ring. Then since there is no number stating where the ethyl is, it is understood that it is at the first carbon. Do you know what an ethyl is?

Answer 5

2nd one I'm not sure if i'm right or wrong

Answer 6

Ethyl is CH2CH3 or CH5 right?

Answer 7

and c) I got

Answer 8

also what is

Answer 9

always remember that when your given a compound with -yne, it MUST contain a triple bond, -ene contains double bond and -ane contains single bond.

Answer 10

Ethyl is C2H5 derived from ethane C2H6 according to http://en.wikipedia.org/wiki/Ethyl_group

Sorry I forgot myself. I THINK the second one looks right, except the ethyl.

Answer 11

so the last drawing will be 4,4-dimethylpent-2-ene.........also, always remember that the double bond has priority.

Answer 12

so for the second i should write C2H5 instead of CH2CH3?

Answer 13

if triple bond it should be 4,4-dimethylpentyne right?

Answer 14

yes

Answer 15

you could write C2H5 as its much clear.

Answer 16

for the b) should I of taken out the H's from the double bond? It should just be c's or ch's?