Class 11 NEET Chemistry Organic Chemistry Some Basic Principles And Techniques Part 1

5

C

H3

4

C

H=

3

C

H

2

C

≡

1

C

H
   Pent-3-en-1-yne
If a molecule contains both carbon-carbon double or triple bonds, the two are treated at par in seeking the lowest number combination. However, if the sum ofnumbers turns out to be the same starting from either of the carbon chain, then lowest number is given to the C = C double bond.