NEET Chemistry Questions: Basic Principles of Orgainc Chemistry

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What is not true about homologous series ?




In a homologous series, the physical properties of the compounds, such as boiling and melting points, gradually change with an increase in molecular mass. Thus, they do not have identical physical properties. The similar chemical properties and the ability to be represented by a general formula are true characteristics of a homologous series.
The total possible number of chain isomers for the molecular formula $C_5H_{12}$ would be –




The molecular formula $C_5H_{12}$ corresponds to pentane, which has three chain isomers: n-pentane, isopentane (methylbutane), and neopentane (dimethylpropane).
2-chlorobutane & 3-chlorobutane are




2-chlorobutane and 3-chlorobutane are positional isomers because they differ in the position of the chlorine atom on the carbon chain. In 2-chlorobutane, the chlorine is attached to the second carbon, while in 3-chlorobutane, it is attached to the third carbon.
Which one of the following pairs are called position isomers –




No explanation available.
Which of the following are isomers -




No explanation available.
How many aliphatic carbonyl compounds are possible having the molecular formula $C_5H_{10}O$ –




No explanation available.
The formula $C_4H_8O_2$ represents




No explanation available.
The number of ether metamers represented by the formula $C_4H_{10}O $ is -




The formula $C_4H_{10}O$ can give rise to three ether metamers: 1. Diethyl ether (CH$_3$CH$_2$OCH$_2$CH$_3$), 2. Methyl propyl ether (CH$_3$OCH$_2$CH$_2$CH$_3$), and 3. Ethyl methyl ether (CH$_3$CH$_2$OCH$_3$). These are the three possible structures, hence the correct option is 3.
The phenomenon involving the migration of a proton to give two structural isomers in equilibrium with each other is known is –




Tautomerism is a phenomenon where a proton migrates between two structural isomers that are in equilibrium with each other. A common example is the keto-enol tautomerism, where a proton shifts between the oxygen and carbon atoms.
In keto-enol tautomerism of dicarbonyl compounds, the enol form is preferred in contrast to the keto-form, this is due to




No explanation available.
The maximum number of structural isomers (acyclic and cyclic) possible for $C_4 H_6$ are




No explanation available.
The structures $(CH_3)_3– CBr $and $CH_3(CH_2)_3 Br $ present




No explanation available.
The compound $C_4 H_{10}O$ can show




The compound $C_4H_{10}O$ can show metamerism (e.g., diethyl ether and methyl propyl ether), functional isomerism (e.g., butanol and methoxypropane), and position isomerism (e.g., 1-butanol and 2-butanol). Thus, it exhibits all these types of isomerism.
Which one of the following can exhibit cis-trans isomerism?




Cis-trans isomerism (also known as geometric isomerism) occurs in alkenes where there are two different groups attached to each carbon of the double bond. In $ClCH = CHCl$, the double-bonded carbons each have different groups (H and Cl), allowing for the existence of cis and trans forms.
Compound having open chain is -




An open chain compound is a compound with a linear or branched structure and no rings. Pentane, isopentane, and neopentane all have open chain structures. Therefore, the correct answer is 'All the above'.