Which hydrocarbon belongs to the Alkyne homologous series?
(A) CHCH
(B) CH2CH2
(C) CH3CH3
(D) CH3CH2CH2CH3

(A) CHCH

Explanation:

Hello,

Alkynes are formed when triple bonds are formed between carbons, it means that due to the triple bonds, three bonds are already exhausted and carbon atoms need four bonds to attain the octet, for that reason, an extra bond is allowed. Now, such extra bond, when talking about hydrocarbons is filled with hydrogens, for that reason the alkyne should be (A) CHCH as it also accomplishes the following formula which is not accomplished by the rest of the options:

Since n=2, we have:

Which matches with CHCH.

Best regards.

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

you gotta add the following molecules so we can give u an answer

explanation: