WAEC Chemistry 2012 Objective — Question 45

Question 45 of 50 from the West African Examinations Council (WAEC) Chemistry 2012 Objective paper, with the correct answer and a full explanation.

The alkyne that will give a white precipitate with silver trioxonitrate(V) is

A. CH3CH2C≡CCH2CH3
B. CH3C≡CCH2CH3
C. CH3CH2CH2C≡CHCorrect
D. CH3CH2CH2C≡CCH3

Explanation

A terminal alkyne is one that has the triple bond at the end of the chain, e.g. CH3CH2CH2C≡CH. Only terminal alkynes give a white precipitate with silver trioxonitrate(V).

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