18. A molecule is said to be optically active whea it I has a chiral center. III. rotates the plane of polarization of light. 1. las a plane of ey zumetry. A. I and II Bii and III C) III D) I, II and III 19. Arranges the following accerding to increasing rate of hydrolysis: i. I methy i p-nitrebenzoate X) methylbenzoate Yi methyl p-methylbenzo

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18. A molecule is said to be optically active whea it I has a chiral center. III. rotates the plane of polarization of light. 1. las a plane of ey zumetry. A. I and II

B i i

and

III

C) III D) I, II and III 19. Arranges the following accerding to increasing rate of hydrolysis: i. I methy i p-nitrebenzoate

X)

methylbenzoate Yi methyl p-methylbenzoate Z) methyl p-aminobenzoatc A)

2 X : Z

B) ZYXW C) YZXW D) ZYW'X 20 . Whith if the following could carry wat the couversion shown above? A, 1. Nis ether D)

1. NaOH

2.

CO_{2}

2.

CrO_{2} H_{2} SO_{4}

3.

IH_{3} O^{\circ}

B) 1.0 , E)

1. Li

2.

Zn, H_{2} O

2.

H_{2} C = O

C. I.

K, NNO_{6} OH

3.

H_{3} O^{*}

2. Hi

O^{*}

I. prepure butanoic acid from 1.propanol, which sequence of reagent(s) is are hest empioyed? A)

K_{2} Cr_{2} O

, in acid C)

LiNHH_{4}

B)

PBr_{3}, NaCN : H_{2} O, Ir^{*}

D)

NaCN; H_{2} O; II^{*}

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