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# Which of the following correctly represents the $+I$ effect of the substituents :

$(a)\; O^- > COO^{-} > CR_3 \\(b)\; COO > O ^- > CR_3 \\(c)\;O^- < COO^{-} < CR_3 \\ (d)\; COO^{-} < O^{-} < CR_3$

Groups or atoms which donate electrons to the carbon chain are said to have electron releasing or +I effect.
So, $O^- > COO^{-} > CR_3$
Hence a is the correct answer.