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8-4.Organic Chemistry : Reaction mechanism question bank (Chemistry)

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Q1.

What is the decreasing order of basic strength for the following ions: $OH^-$,$NH_2^-$,$HC \equiv C^-$,and $CH_3CH_2^-$?

(A)

$CH_3CH_2^- \gt NH_2^- \gt HC \equiv C^- \gt OH^-$

(B)

$HC \equiv C^- \gt CH_3CH_2^- \gt NH_2^- \gt OH^-$

(C)

$OH^- \gt NH_2^- \gt HC \equiv C^- \gt CH_3CH_2^-$

(D)

$NH_2^- \gt HC \equiv C^- \gt OH^- \gt CH_3CH_2^-$

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Q2.

What is the decreasing order of basic strength for the following species: $\mathop O\limits^\Theta H, \mathop N\limits^\Theta H_2, HC \equiv \mathop C\limits^\Theta, CH_3 - \mathop C\limits^\Theta H_2$?

(A)

$CH_3 - \mathop C\limits^\Theta H_2 \gt \mathop N\limits^\Theta H_2 \gt HC \equiv \mathop C\limits^\Theta \gt \mathop O\limits^\Theta H$

(B)

$HC \equiv \mathop C\limits^\Theta \gt CH_3 - \mathop C\limits^\Theta H_2 \gt \mathop N\limits^\Theta H_2 \gt \mathop O\limits^\Theta H$

(C)

$\mathop O\limits^\Theta H \gt \mathop N\limits^\Theta H_2 \gt HC \equiv \mathop C\limits^\Theta \gt CH_3 - \mathop C\limits^\Theta H_2$

(D)

$\mathop N\limits^\Theta H_2 \gt HC \equiv \mathop C\limits^\Theta \gt \mathop O\limits^\Theta H \gt CH_3 - \mathop C\limits^\Theta H_2$

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