Please confirm that the compounds you have written are correct. I'm answering according to butane nitrile and 2 methyl propane nitrile. These are chain isomers as they have same molecular formula but different number of carbon atoms in parent chain.

< b="" />Isomerism in Bitane Nitrile and 2-Methylnitrile< />

Isomerism is the phenomenon in which two or more compounds have the same molecular formula but different structural arrangements or spatial orientations, resulting in different chemical and physical properties. In the case of bitane nitrile and 2-methylnitrile, they exhibit different types of isomerism.

< b="" />Structural Isomerism< />

Structural isomerism occurs when two or more compounds have the same molecular formula but differ in the connectivity of atoms. In the case of bitane nitrile, it has the molecular formula C4H9CN. It can exist in two different structural isomers:

1. < b="" />Straight-chain Isomer:< /> The straight-chain isomer of butane nitrile is also known as n-butyl cyanide. In this isomer, the carbon atoms are connected in a linear arrangement with the CN group attached to the fourth carbon atom.

2. < b="" />Branched-chain Isomer:< /> The branched-chain isomer of butane nitrile is also known as isobutyl cyanide. In this isomer, the carbon atoms form a branched arrangement, with the CN group attached to the second carbon atom.

< b="" />Stereoisomerism< />

Stereoisomerism occurs when two or more compounds have the same molecular formula and connectivity of atoms but differ in the spatial arrangement of atoms or groups. In the case of 2-methylnitrile, it has the molecular formula C4H7CN. It can exist in two different stereoisomers:

1. < b="" />Geometric Isomerism:< /> Geometric isomerism is a type of stereoisomerism that arises due to restricted rotation around a double bond or a ring. In the case of 2-methylnitrile, it can exhibit geometric isomerism if there is a double bond present. However, if there is no double bond, this type of isomerism is not applicable.

2. < b="" />Optical Isomerism:< /> Optical isomerism is a type of stereoisomerism that arises due to the presence of chiral centers in a molecule. Chiral centers are carbon atoms bonded to four different groups. In the case of 2-methylnitrile, if there is a chiral center present, it can exhibit optical isomerism. However, if there is no chiral center, this type of isomerism is not applicable.

< b="" />Syllabus Covered in NEET 2020< />

The NEET (National Eligibility cum Entrance Test) is a national-level medical entrance exam in India. The syllabus for NEET 2020 includes topics from Physics, Chemistry, and Biology. Here is a brief overview of the syllabus covered in each part:

1. < b="" />Physics:< /> The physics section of NEET 2020 covers topics such as Laws of Motion, Thermodynamics, Optics, Electrostatics, Magnetic Effects of Current and Magnetism, Electronic Devices, etc.

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