What is the increasing order of reactivity of the following compounds towards SN1 reactions?
(A). \(C _6 H _5 CH _2 Br\)
(B). \(C _6 H _5 CH \left( C _6 H _5\right) Br\)
(C). \(C _6 H _5 C \left( CH _3\right)\left( C _6 H _5\right) Br\)
(D). \(C _6 H _5 CH \left( CH _3\right) Br\)
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Arrange the following alcohols in decreasing order of acidity:

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Which of the following reaction mechanism is involved in Williamson synthesis?
\(R - X + R ^{\prime}- O - N a \rightarrow R - O - R ^{\prime}+ N a X\)
If \(\text{R} = \text{CH}_3\).

Read the passage carefully and answer the Questions
Alcohols and phenols are obtained when a hydrogen atom in aliphatic and aromatic hydrocarbons respectively, is replaced by \(OH\) group. These compounds find wide applications in industry as well as in our daily life. You may notice that ordinary spirit is used for polishing wooden furniture which is chiefly a compound containing hydroxyl group. An alcohol contains one or more hydroxyl \((OH)\) group(s) directly attached to carbon atom(s), of an aliphatic system \((CH_3OH)\) while a phenol contains \(OH\) group(s) directly attached to carbon atom(s) of an aromatic system \((C_6H_5OH)\). Alcohols are prepared by the hydration of alkenes, fermentation of glucose, and reduction of carbonyl compounds. Alcohols produce alkenes upon dehydration whereas alkenes on acid catalyzed hydration convert into alcohols.
Which of the following compounds lacks phenolic group?

Which of the following statements about gold (Au) element are correct ?
(A) quad Gold occurs in nature in native state.
(B) quad Gold discolves in aqua-regia.
(C) quad Gold is extracted by leaching the metal with dilute NaCN .
(D) \quad Leaching is followed by replacement reaction.
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Match List-I with List-II

List-I	List-II
(A) D	(I) Loss of blood clotting
(B) C	(II) Rickets
(C) \(B_6\)	(III) Scurvy
(D) K	(IV) Convulsions

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Question 4 (IUPAC Name of Freon 12):
The correct IUPAC name of Freon 12 is

Oparin and Haldane's theory of chemical evolution of life was experimentally supported by:

\(\int \frac{\cos x - \sin x}{1 + \sin 2x} dx\) is equal to:

For first order decomposition of \(N _2 O _5\) at constant volume, \(p_i\) is initial pressure
and \(p_t\) is pressure at any time \(t\) during the reaction.
Which of the following statement/s is incorrect?
(A) Half life does not depend on initial pressure
(B) Total pressure decreases with time
(C) Rate constant will be the same if initial pressure is doubled
(D) \(k=\frac{2.303}{t} \log \left(\frac{p_t}{p_i}\right)\)
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When \(1.5\) g of a non-volatile solute is dissolved in \(30\) g of a solvent, the boiling point of the solvent is raised by \(2\ K\). Calculate the molar mass of the solute, given that \(K_b\) for the solvent is \(1.85\ K\ kg\ mol^{-1}\).

Which of the following statements about hormones is incorrect?

Two large plane parallel sheets with equal but opposite surface charge densities \(+\sigma\) and \(-\sigma\). A point charge q placed at points P1, P2, and P3 experiences forces F1, F2, and F3 respectively. Then :