Question

Which of the following reaction intermediates has
linear structure ?
(1) Singlet carbene (2) Alkyl free radical
(3) Triplet carbene (4) Alkyl carbanion

answer is (3) please explain​

Answer 1

Explanation:

A reaction intermediate or an intermediate is a molecular entity that is formed from the reactants (or preceding intermediates) and reacts further to give the directly observed products of a chemical reaction. Most chemical reactions are stepwise, that is they take more than one elementary step to complete.

Answer 2

Option (3) Triplet carbene

Triplet carbene has a  linear structure

Explanation for correct answer:

(3) Triplet carbene- the triplet has two unpaired electrons, each occupying a separate orbital. they will be either linear or bent, i.e. sp or sp2 hybridized, The geometry of this group will be either linear or bent. If it's linear geometry, then it's an sp hybrid structure. But if it's bent geometry, then it's an sp2 hybrid structure.

Explanation for incorrect answer:

(1) Singlet carbene - a singlet carbene incorporates a pair of electrons in a very single orbital,

Singlet carbenes are spin-paired. within the language of valence bond theory, the molecule adopts an sp2 hybrid structure

(2) Alkyl radical- The central `C` atom of alkyl free radical makes use of three sp2   HO- form three sigma bonds which are directed towards the corners of an equiangular triangle.

(4) Alkyl carbanion- Ammonia has a pyramidal shape. The atom carrying charge has an octet of electrons

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