Base strength of (1) CH_3 CH_2 (2) H_2 C= C H and (3) H-C C is in the order of

Correct answer: D. (1) > (2) > (3) Key Idea : Stronger the acid, weaker is its conjugate base. The strength of their conjugate acids are in the order : HC CH>H_2 C=CH _2>CH_3-CH_3 Therefore, the correct order of strength of their conjugate base is : CH_3 CH_2^ >H_2 C= C H>HC C

NEET 2008

Exam: NEET
Year: 2008
Subject: Chemistry
Chapter: General Organic Chemistry

NEET 2008 · Chemistry · General Organic Chemistry

Base strength of (1) CH_3 CH_2 (2) H_2 C= C H and (3) H-C C is in...

Base strength of (1)

\mathrm{CH}_3 \stackrel{\ominus}{\mathrm{CH}_2}

(2)

\mathrm{H}_2 \mathrm{C}=\stackrel{\ominus}{\mathrm{C} \mathrm{H}}

and (3)

\mathrm{H}-\mathrm{C} \equiv \stackrel{\ominus}{\mathrm{C}}

is in the order of

Options

A(2) $>$ (1) $>$ (3)
B(3) $>(2)>(1)$
C $(1)>(3)>(2)$
D(1) $>$ (2) $>$ (3)

Correct answer

D. (1) $>$ (2) $>$ (3)

Step-by-step solution

Key Idea : Stronger the acid, weaker is its conjugate base. The strength of their conjugate acids are in the order :

\mathrm{HC} \equiv \mathrm{CH}>\mathrm{H}_2 $\mathrm{C}=\mathrm{CH}$_2>\mathrm{CH}_3-\mathrm{CH}_3

Therefore, the correct order of strength of their conjugate base is :

\mathrm{CH}_3 \mathrm{CH}_2^{\ominus}>\mathrm{H}_2 \mathrm{C}=\stackrel{\ominus}{\mathrm{C}} \mathrm{H}>\mathrm{HC} \equiv \stackrel{\ominus}{\mathrm{C}}

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