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Which of the following shows geometrical isomerism?

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Important Questions on Organic Chemistry- Some Basic Principles and Techniques

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The following isomeric pair is an example of which of the following?

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How many constitutionally isomeric ethers are possible for the formula, C4H10O?
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Among the following geometrical isomerism is not exhibited by:
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A solution of 7.5 g of optically active compound in 100 ml solution showed an optical rotation of +1.2°. The specific rotation of its enantiomer (if the length of the polarimeter tube is 10 cm) is:
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Which of the following is a chiral compound?
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The number of stereoisomers possible for the compound  CH3-CH=CH-CH(OH)-CH3 is/are:
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The number of optically active isomers of 2-chloro-3-iodo butane are:
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Identify the correct statements about the compound: 

  CH3(OH)HC-CH=CH-CH(OH)CH3                (Y)

(a) If stereochemistry around the double bond in Y is cis, the number of enantiomers possible for Y is 2.

(b) There are 4 meso stereoisomers possible for Y.

(c) Total number of stereoisomers possible for Y is 4.

(d) All stereoisomers of Y are optically active.