Question

Which compound is an alkyne?
(1) C2H2 (3) C4H8
(2) C2H4 (4) C4H10

Answer 1

the answer is C2H2 because an alkyne compound consists of a series of unsaturated hydrocarbons with a triple bond.

Answer 2

Answer:
`C_2H_2`

Step-by-step explanation:

Saturated hydrocarbons are defined as the hydrocarbons in which a single bond is present between carbon and carbon atoms. The general formula for these hydrocarbons is
`C_nH_(2n+2)` and are called as alkanes.

Unsaturated hydrocarbons are defined as the hydrocarbons which have double or triple covalent C-C bonds. They are known as alkenes and alkynes respectively. The general formula for these hydrocarbons is
`C_nH_(2n)` and
`C_nH_(2n-2)` respectively.

`C_4H_8` and
`C_2H_4` are alkenes.

`C_4H_(10)` is an alkane.

Thus
`C_2H_2` with general formula
`C_nH_(2n-2)` is an alkyne.