How can you tell when a molecule has one triple bond?

Answer 1

You have to draw it out. This would be easier if you gave a compound but if you have CO (Carbon Monoxide) then:

C = 4 (4th from left)
O = 6 (6th from left)
= 10

So you have the octet rule which means an ion can't have more than 8 bonding pairs, so CO means 8+8=16

So you have 16 bonding ions and only need 10, so the you have 6 move inbetween the C and the O to make it a triple bond (2 = bond pair)

Hard to show here, but:
.. ..
: C:O: becomes :C:::O:
·· ··

Answer 2

In addition to the methods mentioned above , in case of diatomic molecules u may also calculate the bond order which is = 0.5 x (no of bonding electrons - no of antibonding electrons)

if bond order = 3 , then the molecule contains a triple bond.

Answer 3

Take a sample of the compound and run an IR spectrum.

Triple Bonds will appear in the 1900-2300 region, depending on the exact kind of triple bond you have.

Answer 4

one easy way is to do a lewis dot structure with the compound. You can see the various bonds and lone pairs

Answer 5

By conducting some experiments as how many H or Br atoms it takes up, does it respond to Ag-NH3 test etc.

Answer 6

It's called an 'ALKYNE' as in 'ETHYNE'
Where Ethane C2H6 (CH3-CH3) has been de-hydogenated to C2H2 (CH≡CH).