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The number of different substitution products possible when ethane is allowed to react with Clorine in sunlight are:

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Explanation

When ethane (C2H6) reacts with chlorine in the presence of sunlight (free radical chlorination), it can give nine different substitution products: C2H5Cl, C2H4Cl2, C2H3Cl3, C2H2Cl4, C2HCl5, C2Cl6, CH3CHCl2, CH2ClCHCl2, and CHCl2CHCl2.

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In butane, which of the following forms has the lowest energy?

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Explanation

(c) The staggered form has lower energy than eclipsed form because of repulsive interaction between the H-atoms attached to two carbon atoms are minimum due to maximum distance between them.

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The group named as benzal possesses .... nature.

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Explanation

(b) Benzal is C6H5CH group.

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Which of the following structures permits cis-trans isomerism?

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Explanation

(d) Molecules with two similar groups attached on either of the doubly bonded carbon do not show geometrical isomerism.

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A compound contains 2 dissimilar asymmetric carbon atoms. The number of optically active isomers is:

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Explanation

(c) a = 2n; where n is no. of dissimilar asymmetric carbon atoms and a is no. of optically active isomers.

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Geometrical isomerism is caused:

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Explanation

(a)

 Due to the hindered rotation around carbon-carbon double bond, the relative positions of atoms or group attached to the doubly bonded carbon atoms get fixed.

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α-D-glucose and β D-glucose have a specific rotation of +112° and +19° respectively. In aqueous solution the rotation becomes +52°. This process is called:

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Explanation

(c) The conversion of α-glucose to B-glucose is called mutarotation.

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Which of the following is optically active?

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Explanation

Alanine is an optically active amino acid. 2-butanol is a chiral compound containing an asymmetric carbon atom, making it optically active. Lactic acid also contains an asymmetric carbon atom and is therefore optically active. Since all the given options are optically active, the correct answer is 'All of these'.

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The isomerism which exists between CH3CHCl2 and CH2ClCH2Cl is:

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Explanation

(c) The positions of Cl are different.

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Lactic acid is:

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Explanation

(c) Lactic acid is CH3βCαHOHCOOH, i.e., α-hydroxy propanoic acid.

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