Question

What is the decreasing order of strengths of the following bases?
$OH , NH _2^{\ominus}, H - C \equiv C$, and $CH _3- CH _2^{\ominus}$

• A. $CH _3- CH _2^{\ominus}> NH _2^{\ominus}> H - C \equiv C ^{\ominus}>\overset{\ominus}{ O}H $
• B. $H - C \equiv C ^{\ominus}> CH _3- CH _2^{\ominus}> NH _2^{\ominus}>\overset{\ominus}{ O}H $
• C. $\overset{\ominus}{ O}H > NH _2^{\ominus}> H - C \equiv C ^{\ominus}> CH _3- CH _2^{\ominus}$
• D. $NH _2^{\ominus}> H - C \equiv C ^{\ominus}>\overset{\ominus}{ O}H > CH _3- CH _2^{\ominus}$

Answer 1

Answer: (A)

Acidity: $H _2 O > HC \equiv CH > NH _3> CH _3 CH _3$
Basicity : $\overset{\ominus}{ O}H < HC \equiv C ^{\ominus}<\overset{\ominus}{ N}H _2< CH _3 \overset{\ominus}{ C}H _2$