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JEE CHEMISTRY MCQ: ORGANIC CHEMISTRY-SOME BASIC PRINCIPLES AND TECHNIQUES

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Analyzing +4 | -1
Which of the following resonance structure is least stable?
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Correct option: B
CH2=CH−C + H−C−H−OCH3{\text{C}}{{\text{H}}_{\text{2}}} = {\text{CH}} - \mathop {\text{C}}\limits^{\text{ + }} {\text{H}} - \mathop {\text{C}}\limits^ - {\text{H}} - {\text{OC}}{{\text{H}}_{\text{3}}}
Option B (CH2=CH−C + H−C−H−OCHext3{\text{C}}{{\text{H}}_{\text{2}}} = {\text{CH}} - \mathop {\text{C}}\limits^{\text{ + }} {\text{H}} - \mathop {\text{C}}\limits^ - {\text{H}} - {\text{OC}}{{\text{H}}_{ ext{3}}}) is the least stable because it has adjacent positive and negative charges on carbon atoms.

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Keto-enol tautomerism is not observe in How many isomers of C5H11OH{C_5}{H_{11}}OH will be primary alcohols? Which statement is true? Common reactions of benzene and its derivatives are: How many structural formulae are possible for C5H11Cl?{\mathrm{C}_5}{\mathrm{H}_{11}}\mathrm{Cl}? Assertion (A): The compounds that have the same constitution and sequence of covalent bonds but differ in relative positions of their atoms or groups in space are called stereoisomers.

Reason (R): Stereoisomerism is a special type of isomerism which can be classified as geometrical and optical isomerism
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