Question

The third member of the family of alkenynes has the molecular formula?

• A. $C_6{H}_6$
• B. $C_5{H}_6$
• C. $C_6{H}_8$
• D. $C_4{H}_4$

Answer 1

The correct option is C $C_6{H}_8$

Alkynes are compounds with adjacent ene (double) and yne (triple) bonds.

Now refer to given image for following :

1st member of enyne family= R1, R2, R3, R4 = H

Formula = $C_4{H}_4$

2nd member of enyne family= R1=CH3; R2, R3, R4 = H

Formula = $C_5{H}_6$

3rd member of enyne family= R1, R2=CH3; R3, R4 = H

Formula = $C_6{H}_8$

(C) is the correct answer.