Question
Give conversion in three steps: Nitrobenzene into chlorobenzene.
✓
Answer
→Nitrobenzene into chlorobenzene
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Why is the vapour pressure of an aqueous solution of glucose lower than that of water?
Match the properties given in Column I with the metals given in Column II.
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Column I (Property)
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Column II (Metal)
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(i)
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An element which can show +8 oxidation state
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(a)
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Mn
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(ii)
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3d block element that can show upto +7 oxidation state
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(b)
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Cr
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(iii)
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3d block element with highest melting point
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(c)
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Os
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(d)
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Fe
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Explain solubility of gas in a liquid solvent.
Write the structures of $A, B$ and $C$ in the following$:$
→- $\text{C}_{6}\text{H}_{5}-\text{CONH}_{2}\xrightarrow{Br_2/aq.KOH}A\xrightarrow[0-5^oC]{NaNO_2+Hcl}B\xrightarrow{KI}C$
- $\text{CH}_{3}-\text{Cl}\xrightarrow{KCN}A\xrightarrow{LiAlH_4}B\xrightarrow[\Delta]{CHCl_3+alc.KOH}C$
Write the Nernst equation and emf of the following cells at $298\ K:$
$Sn(s) | Sn^{2+}(0.050\ M) || H^+ (0.020\ M) | H_2(g) (1\ bar) | Pt(s)$
→$Sn(s) | Sn^{2+}(0.050\ M) || H^+ (0.020\ M) | H_2(g) (1\ bar) | Pt(s)$
A solution prepared by dissolving 8.95mg of a gene fragment in 35.0mL. of water has an osmotic pressure of 0.335 torr at 25°C. Assuming that the gene fragment is a non-electrolyte, calculate its molar mass.
Match the example given in Column I with the name of the reaction in Column II.
| Column I (Example) | Column II (Reaction) | ||
| (i) | $\ \ \ \ \ \ \ \ \ \ \ \ \ \text{O}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{O}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ || \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ||\\\text{CH}_3-\text{C}-\text{Cl}+\text{H}_2\xrightarrow{\text{Pd-C/BaSO}_4}\text{CH}_3-\text{C}-\text{H}$ | (a) | Friedel Crafts acylation |
| (ii) |  |
(b) | HVZ reaction |
| (iii) |  |
(c) | Aldol condensation |
| (iv) | $\text{R}-\text{CH}_2-\text{COOH}\xrightarrow{\text{Br}_2/\text{Red}\ \text{P}}\text{R}-\text{CH}-\text{COOH}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ^\text{Br}$ | (d) | Cannizaro’s reaction |
| (v) | $\text{CH}_3-\text{CN}\xrightarrow[\text{(ii)}\ \text{H}_2\text{O}/\text{H}^+]{\text{(i)}\ \text{SnCl}_2/\ \text{HCl}}\text{CH}_3\text{CHO}$ | (e) | Rosenmund’s reduction |
| (vi) | $2\text{CH}_3\text{CHO}\xrightarrow{\text{NaOH}}\text{CH}_3-\text{CH}=\text{CH}=\text{CHCHO}$ | (f) | Stephen’s reaction |
Nalorphene $\left( C _{19} H _{21} NO _3\right)$, similar to morphine, is used to combat withdrawal symptoms in narcotic users. Dose of nalorphene generally given is 1.5 mg. Calculate the mass of $1.5 \times 10^{-3} m$ aqueous solution required for the above dose.
→Give the structure of the products you would except when each of the following alcohol reacts with (i) Butan-lol (ii) 2- Methylbutan-2-ol
a. $HCl - ZnCl _2$
b. HBr
c. $SOCl _2$
→a. $HCl - ZnCl _2$
b. HBr
c. $SOCl _2$
The following data were obtained during the first order thermal decomposition of $\ce{N2O5(g)}$ at a constant volume:
$\ce{2N2O5(g) \rightarrow 2N2O4(g) + O2(g)}$
Calculate the rate constant.
→$\ce{2N2O5(g) \rightarrow 2N2O4(g) + O2(g)}$
| S. No. | $\text{Time/s}$ | $\text{Total pressure/atm}$ |
| $1.$ | $0$ | $0.5$ |
| $2.$ | $100$ | $0.512$ |