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Nomenclature of Unsaturated Hydrocarbons

The primary c...

Question

The primary cause of geometrical isomerism is due to

A

The presence of double bond

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B

The presene of pi bond

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C

Planar structure

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D

Restricted rotation

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Solution

The correct option is D
Restricted rotation

Compounds which have same molecular formula but differ in the spatial arrangement of atoms about the double bond are called geometrical isomers. Geometrical Isomerism is shown by compounds which have restricted rotation around the carbon atoms. Cyclo alkanes also exhibit geometrical isomerism.

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The isomerism that arises due to the restricted bond rotation is:

Q. The isomerism that arises due to restricted bond rotation is:

Q. The restricted rotation about carbon double bond in 2-butene is due to

Q. Geometrical isomerism is a kind of stereoisomerism which is present in the compounds containing a double bond

(C = C, C = N . N = N)

and arise due to the restricted or frozen rotation about the double bond. The atoms or groups attached to the doubly bonded carbons must be different. In aldoximes, the isomer is named as syn if hydrogen and hydroxyl groups are on the same side of

C = N

bond and if these are on opposite sides, the isomer is named as anti. In ketoximes, the prefixes syn and anti indicate which group of ketoxime is syn or anti to hydroxyl group.
On treating with

N H_{2} O H

, which can form two products?

Q. Assertion :Formation of a pi bond restricts the rotation of the bond. Reason: While rotating the double bond, the perpendicular laterally overlapped p orbitals will reach non overlapping position.

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