please answer all the questions of this f part

Dear Student

(i) Propyne
 Ethanal

(ii) The carbon - carbon bond length of ethyne is 120 pm that is C-C 120 pm. The C-H bond length of ethyne is 106 pm that is C-H 106 pm. Ethyne has a Linear geometry.

(iii) Ethane

(iv)

Regards