In which compound are all the carbon atoms \({\text{s}}{{\text{p}}^{\text{2}}}\)hybridized?

A.     

B.     

C.     \({\text{C}}{{\text{H}}_{\text{2}}}{\text{CHC}}{{\text{H}}_{\text{3}}}\)

D.     \({\text{C}}{{\text{H}}_{\text{3}}}{\text{C}}{{\text{H}}_{\text{2}}}{\text{CHCHC}}{{\text{H}}_{\text{2}}}{\text{C}}{{\text{H}}_{\text{3}}}\)

A

One respondent claimed that this question was too difficult. However, Topic 14.2 on hybridization is firmly on the syllabus and candidates should be expected to be able to answer this type of question. The question itself was correctly answered by 79.08% of candidates, and was the thirteenth easiest question on the paper.