4
lesson pretestMultiple Choice

Pretest

Question 4 • Chemistry

What is the molecular shape of HCN ?

Answer
A
angular
B
trigonal pyramidal
C
linear
D
bent

Explanation

In HCN, carbon is the central atom, bonded to hydrogen and triple-bonded to nitrogen. Around carbon there are two regions of electron density, which arrange themselves 180° apart. Therefore, HCN has a linear molecular shape; the correct choice is C, linear.

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