Question:
Which of the following exhibits \(-\)I effect?
Which of the following exhibits \(-\)I effect?
Show Hint
Alkyl groups push electrons (+I), whereas the nitro group pulls electrons strongly (-I).
Updated On: Nov 12, 2026
- \(-\text{C}(\text{CH}_{3})_{3}\)
- \(-\text{NO}_{2}\)
- \(-\text{C}_{2}\text{H}_{5}\)
- \(-\text{CH}_{3}\)
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
A group shows a \(-\)I effect when it withdraws sigma electrons towards itself more strongly than hydrogen does.
Step 2: Check the groups
\(-\text{C}(\text{CH}_{3})_{3}\), \(-\text{C}_{2}\text{H}_{5}\) and \(-\text{CH}_{3}\) are alkyl groups. They release electrons and show a \(+\)I effect.
Step 3: Nitro group
In \(-\text{NO}_{2}\) the nitrogen carries a formal positive charge and is bonded to electronegative oxygen atoms, so the group withdraws electrons.
Final Answer:
The nitro group \(-\text{NO}_{2}\) shows the \(-\)I effect. \[ \boxed{\text{(B) }-\text{NO}_{2}} \]
A group shows a \(-\)I effect when it withdraws sigma electrons towards itself more strongly than hydrogen does.
Step 2: Check the groups
\(-\text{C}(\text{CH}_{3})_{3}\), \(-\text{C}_{2}\text{H}_{5}\) and \(-\text{CH}_{3}\) are alkyl groups. They release electrons and show a \(+\)I effect.
Step 3: Nitro group
In \(-\text{NO}_{2}\) the nitrogen carries a formal positive charge and is bonded to electronegative oxygen atoms, so the group withdraws electrons.
Final Answer:
The nitro group \(-\text{NO}_{2}\) shows the \(-\)I effect. \[ \boxed{\text{(B) }-\text{NO}_{2}} \]
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