Question

In an alkyne compound, if the number of carbon atoms is five, then what is the number of hydrogen atoms in this compound?

• A. 10
• B. 12
• C. 8
• D. 14

Answer 1

The correct option is C

8

The general formula for alkynes is $C_n{H}_{2n-2}$.

If the number of carbon atoms is five then $n$=5.

So if we substitute this value in the general formula we get

$C_5{H}_{2\times 5-2}$

$C_5{H}_{10-2}$

$C_5{H}_8$

So the number of hydrogen atoms is 8 in the given compound.