Question

27. The compound having only primary hydrogen atoms is ( ).

(A) isobutene
(B) 2,3-dimethylbutene
(C) cyclohexane
(D) propyne
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Answer 1

The correct answer is - (a) isobutene.

Step-by-step explanation:

A 1° or primary hydrogen atom is one that is bonded to a 1° carbon atom; a 2° hydrogen atom is one that is connected to a 2° carbon atom; In isobutene only among all the all option having only primary hydrogen atoms. rest have secondary or teritary hydrogen atoms in them

C1∘H3≡CH: (only 1∘ hydrogen atoms)