Which of the following is singlet carbene? (a) (CH3)3 +C (b) C2 H5 C̈-H (c) CH3-Ċ HCH3 (d) CH2=C

Name: Problem 22, Chapter 24: A Complete Resource Book in Chemistry for JEE Main 2019
Uploaded: 2021-10-14T12:08:50-08:00
Duration: 1 min 20 s
Channel: Narayan Hari
Description: Which of the following is singlet carbene? (a) (CH3)3 +C (b) C2 H5 C̈-H (c) CH3-Ċ HCH3 (d) CH2=CH-+C H2

step 1 As we know that an intermediate and intermediate intermediate neutral species having divalent di

Question

Which of the following is singlet carbene? (a) $\left(\mathrm{CH}_3\right)_3 \stackrel{+}{\mathrm{C}}$ (b) $\mathrm{C}_2 \mathrm{H}_5 \ddot{\mathrm{C}}-\mathrm{H}$ (c) $\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{HCH}_3$ (d) $\mathrm{CH}_2=\mathrm{CH}-\stackrel{+}{\mathrm{C}} \mathrm{H}_2$

   Which of the following is singlet carbene?
(a) $\left(\mathrm{CH}_3\right)_3 \stackrel{+}{\mathrm{C}}$
(b) $\mathrm{C}_2 \mathrm{H}_5 \ddot{\mathrm{C}}-\mathrm{H}$
(c) $\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{HCH}_3$
(d) $\mathrm{CH}_2=\mathrm{CH}-\stackrel{+}{\mathrm{C}} \mathrm{H}_2$

A Complete Resource Book in Chemistry for JEE Main 2019

Atul Singhal 1st Edition

Chapter 24, Problem 22

Instant Answer

Solved by Expert Narayan Hari

10/14/2021

Step 1

A carbene is a neutral molecule containing a carbon atom with only six electrons in its valence shell (instead of the usual eight). In a singlet carbene, the two non-bonding electrons are paired in the same orbital, leaving another orbital completely empty. Show more…

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Which of the following is singlet carbene? (a) $\left(\mathrm{CH}_3\right)_3 \stackrel{+}{\mathrm{C}}$ (b) $\mathrm{C}_2 \mathrm{H}_5 \ddot{\mathrm{C}}-\mathrm{H}$ (c) $\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{HCH}_3$ (d) $\mathrm{CH}_2=\mathrm{CH}-\stackrel{+}{\mathrm{C}} \mathrm{H}_2$

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Key Concepts

Substituent Effects on Carbene Stability

The nature of substituents attached to the carbene center affects whether a carbene favors a singlet or triplet state. Electron-donating groups, for instance, can stabilize the singlet state by helping to delocalize electron density, thus making certain singlet carbenes more accessible and reactive in organic reactions.

Singlet versus Triplet States

Carbenes can exist in two spin states: singlet, in which the two non?bonded electrons are paired in the same orbital (resulting in a diamagnetic species), and triplet, in which the electrons are unpaired in separate orbitals (yielding a paramagnetic species). The electronic configuration profoundly influences their reactivity and behavior.

Carbene

Carbenes are neutral species featuring a divalent carbon atom that has only two bonds and two non?bonded electrons. They are highly reactive intermediates in organic synthesis and can play roles in insertion and addition reactions.

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