Preparation of Alkyl Halides

Q. In the chemical reaction} K2Cr2O7+aH2SO4+bSO2 gives K2SO4+Cr2(SO4)3+cH2O a, b and c are

Q. equivalent weight of cl2 in reaction is: cl_{2\xrightarrow{naoh}}Nacl+Naclo3+H_{2 }o

Q. 23 The total number of configurational isomers given compound are:- CH3-CH=CHCHOHCHOHCH3

Q. In an exothermic reaction, heat is evolved, and system loses heat to the surrounding. For such system

1. $q_p$ will be negative
2. ${△}_{r}H$ will be positive
3. $q_p$ will be positive
4. ${△}_{r}H$ will be negative

Q. 26.Balance the equation Mg+HNO3=Mg(NO3)2+N2O+H2O

Q.

Which one is electrophilic addition

1. 

2. 

3. 

4. 

Q. In preparation of $CHC{l}_3$ from ethanol and bleaching powder, the latter provides

1. $Ca(OH{)}_2$
2. $C{l}_2$
3. Both (a) and (b)
4. None of these

Q. Arrange stability order in phenol, water and ethanol. Explain

Q.

Q. The major product for the following reaction will be C6H6+ (CH3)3-COCl (anh AlCl3)=

Q.

From $B_2{H}_6$, all the following can be prepared except?

1. 

2. 

3. 

4. 

Q. 46. Balance the following equations: 1. H2O2 + PbS ---> PbSO4 + H2O

Q. What will be the product of the following reaction CaCO3(s)+ (NH4) 2C2O4(aq)+ 2NH4OH(aq) ---> ?

Q. Consider the following reaction sequence:
Which option is not true regarding the above reaction sequence?

1. (A) is acidic in nature and can react with NaOH to form a salt
2. (B) is aromatic and has a hydrogen deficiency index of 4.
3. (C) on reaction with Na/ether gives biphenyl.
4. 1-bromo-3-chlororobenzene is not formed as the major compound in the final product

Q. Benzylic free radical is less stable than allylic free radical ?

Q.

What is the correct equilibrium expression (K_sp) for the reaction below:
Ca₃(PO₄)_2(s) ⇌ 3Ca²⁺_(aq) + 2PO₄^2-_(aq)

1. K_sp = [Ca²⁺]³ [PO₄^3-]²

2. K_sp = [3Ca²⁺] + [2PO₄^3-]

3. K_sp = [3Ca²⁺]³ + [2PO₄^3-]²

4. K_sp = [3Ca²⁺][2PO₄^3-]

Q.

Balance the redox reaction using half reaction method,

MnO₄^-+I^-→MnO_2^+IO3^{- , in basic medium.}

Q.

PbO₂ + Cl^- = Pb(OH)₃ + ClO^-

^{how to balance this reaction by half reaction method?}

Q.

Finkelstein reaction for the preparation of alkyl iodide is based upon the fact that

1. Sodium iodide is soluble in methanol, while sodium chloride is insoluble in methanol

2. Sodium iodide is soluble in methanol, while NaCl and NaBr are insoluble in methanol

3. Sodium iodide is insoluble in methanol, while NaCl and NaBr are soluble

4. The three halogens differ considerably in their electronegativity

Q. The starting substance for the preparation of $C{H}_{3}I$ is

1. $C{H}_{3}OH$
2. $C_2{H}_{5}OH$
3. $C{H}_{3}CHO$
4. $(C{H}_3{)}_{2}CO$

Q. Fe2O3+HEAT+H2 GIVES
CO+H2+HEAT GIVES

Q. Solve this: ​Complete the following reactions.

$$\begin{gathered} \mathrm{d})2\mathrm{Na}+{\mathrm{H}}_2\mathrm{O}\underset{}{\to } \\ \mathrm{e})2\mathrm{Li}+{\mathrm{H}}_2\underset{}{\to } \\ \mathrm{f})2\mathrm{Na}+{\mathrm{Cl}}_2\underset{}{\to } \end{gathered}$$

Q. $H-C\equiv C-H\underset{Excess}{\overset{NaN{H}_2}{\to }}[C\equiv C{]}^{2-}2N{a}^{+}\underset{Excess}{\overset{C{H}_{3}C{H}_{2}Br}{\to }}A$