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8 months ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Twelve

Total number of isomers (including stereoisomers) obtained on monochlorination of methylcyclohexane is_______________.

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alok kumar singh

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8 months ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter One

The major product of the following reaction is

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Vishal Baghel

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Birch reduction takes place of carbon connected with electron withdrawing group (-NO₂)

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8 months ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Eight

The spin-only magnetic moment value of the compound with strongest oxidizing ability among MnF₄, MnF₃ and MnF₂ is_________B.M [nearest integer]

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alok kumar singh

Contributor-Level 10

$\overset{+ 4}{M n F_{4}}$ $\overset{+ 3}{M n F_{3}}$

E.C = [Ar] 3d³ [Ar]3d⁴

$\begin{matrix} \overset{+ 2}{M n F_{2}} & [A r] 3 d^{5} \end{matrix} [\begin{array}{l} E_{M n^{3 +} | M n^{2 +}}^{0} = 1.57 V \\ E_{M n^{4 +} | M n^{2 +}}^{0} = 1.27 V \end{array}]$

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8 months ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter One

Which reactant will give the following alcohol on reaction with one mole of phenyl magnesium bromide (PhMgBr) followed by acidic hydrosis?

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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8 months ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Ten

The number of non-ionisable protons present in the product B obtained from the following reaction is______________.

C₂H₅OH + PCl₃ ® C₂H₅Cl + A

A + PCl₃ ® B

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alok kumar singh

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$C_{2} H_{5} O H + P C l_{3} \to C_{2} H_{5} C l + H_{3} P O_{3}$

$H_{3} P O_{3} + P C l_{3} \to H_{4} P_{2} O_{5} + H C l$

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8 months ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter One

The products formed in the following reaction, A and B are

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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8 months ago

Chemistry Electrochemistry

20mL of 0.02 M hypo solution is used for the titration of 10mL of copper sulphate solution, in the presence of excess of KI using starch as an indicator. The molarity of Cu²⁺ is found to be__________* 10^-2 M. [nearest integer]

Given: 2Cu²⁺ + 4I^- ® Cu₂I₂ + I₂

I₂ + $2 S_{2} O_{3}^{2 -} \to 2 I^{-} + S_{4} O_{6}^{2 -}$

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alok kumar singh

Contributor-Level 10

$m e q o f l_{2} = m e q o f N a_{2} S_{2} O_{3} = 20 * 0.002 * 1$

2 * mmol of l₂ = 0.4

mmol of l₂ = 0.2 mmol

mmol of Cu²⁺ = 0.2 * 2 * 10^-3

$[C u^{2 +}] = \frac{0.4 * 1 0^{- 3}}{10 * 1 0^{- 3}} = 0.04 = 4 * 1 0^{- 2} M$

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8 months ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter One

Which of the following compounds in not aromatic?

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Vishal Baghel

Contributor-Level 10

Both indicated hydrogen atoms repel each other so due steric hinderance the given compound becomes non planar. It is non-aromatic.

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8 months ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Two

The elevation in boiling point for 1 molal solution of non-volatile solute A is 3K. The depression in freezing point for 2 molal solution of A in the same solvent is 6 K. The ratio of K_b and K_f i.e. K_b/K_f is 1 : X. The value of X is [nearest integer]

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alok kumar singh

Contributor-Level 10

$Δ T_{b} = i K_{b} m_{1}$

$\frac{Δ T_{b}}{Δ T_{f}} = \frac{K_{b} * 1}{K_{f} * 2} \Rightarrow \frac{3}{6} = \frac{1}{2} = \frac{K_{b}}{k_{f}} * \frac{1}{2}$

$\frac{K_{b}}{K_{f}} = 1 \Rightarrow x = 1$

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8 months ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter One

Which technique among the following is most appropriate in separation of a mixture of 100mg of p-nitrophenol acid and picric acid?

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Vishal Baghel

Contributor-Level 10

Solvent polarity is related to R_f value of nitro compounds

100 mg P-nitrophenol and picric acid have different R_f value on silica gel plate.

Preparative TLC is best to separate 100 mg of P-nitro phenol and picric acid.

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