Question

Total number of nucleophiles from the following is:

$NH_3$, $PhSH$, $(H_3C)_2S$, $H_2C=CH_2$, $\overset{\ominus}{OH}$, $H_3O^{\oplus}$, $(CH_3)_2CO$, $>NCH_3$

• A. 4
• B. 6
• C. 5
• D. 7

Answer 1

Answer: (D)

7

Answer 2

Key nucleophilic species are those with available lone pairs or π‑electrons capable of donating electron density. Identifying each: • $NH_3$: lone pair on N → nucleophile • $PhSH$: lone pair on S → nucleophile • $(H_3C)_2S$: lone pair on S → nucleophile • $H_2C=CH_2$: π‑bond can attack electrophiles → nucleophile • $\negthinspace\!OH^-$: strong nucleophile • $H_3O^+$: protonated, lacks electrons to donate → not nucleophile • $(CH_3)_2CO$: lone pairs on carbonyl O → weak nucleophile • $\!>NCH_3$: lone pair on tertiary N → nucleophile Total = 7 nucleophiles.