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Q. Which one of the following does not have $sp^2$ hybridised carbon?

Jharkhand CECEJharkhand CECE 2008

Solution:

[a] $ \underset{s{{p}^{3}}}{\mathop{C{{H}_{3}}}}\,-\overset{O}{\mathop{\underset{s{{p}^{2}}}{\overset{||}{\mathop{C}}}\,}}\,-\underset{s{{p}^{3}}}{\mathop{C{{H}_{3}}}}\, $ [b] $ \underset{s{{p}^{3}}}{\mathop{C{{H}_{3}}}}\,-\overset{O}{\mathop{\underset{s{{p}^{2}}}{\overset{||}{\mathop{C}}}\,}}\,-OH $ [c] $ \underset{s{{p}^{3}}}{\mathop{C{{H}_{3}}}}\,-\underset{sp}{\mathop{C}}\,\equiv N $ [d] $ \underset{s{{p}^{3}}}{\mathop{C{{H}_{3}}}}\,-\overset{O}{\mathop{\underset{s{{p}^{2}}}{\overset{||}{\mathop{C}}}\,}}\,-N{{H}_{2}} $
Acetonitrile does not contain $ s{{p}^{2}}- $ hybridized carbon.