Grignard Reagents

Q.

Nalorphene (C₁₉H₂₁NO₃), 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 × 10⁻³m aqueous solution required for the above dose.

Q. What is the formula to find number of resonating structures in an organic compound?

Q.

What happens when white phosphorus is heated with concentrated NaOH solution in an inert atmosphere of CO₂?

Q. What is the product of the following reaction?
$\text{Hex-3-ynal}\underset{\text{(iii)}Mg/\text{ether}\text{(iv)}C{O}_2/H_3{O}^{+}}{\overset{\text{(i)}NaB{H}_4\text{(ii)}PB{r}_3}{\to }}$

1. 
2. 
3. 
4. 

Q.

In order to prepare one litre normal solution of potassium permanganate , how many grams of potassium permanganate required if the solution is to be used in acid medium for oxidation

Q. 20 mL of 0.1 M Bacl2 is mixed with 30 mL of 0.2 M Al2(SO4)3. What is the weight of BaSO4 formed?( A of Ba=137).

Q. Alkyl cyanide when react with Grignard reagent , the product on hydrolysis found is

1. Aldehyde
2. Ketone
3. Alcohol
4. Acid

Q. Which one of the following alkenes when treated with $HCl$ yields majorly an anti-Markovnikov product?

1. $Cl-CH=C{H}_2$
2. $H_{2}N-CH=C{H}_2$
3. $F_{3}C-CH=C{H}_2$
4. $C{H}_{3}O-CH=C{H}_2$

Q.

Show how will you synthesize:

(i) 1-phenylethanol from a suitable alkene.

(ii) cyclohexylmethanol using an alkyl halide by an S_N2 reaction.

(iii) pentan-1-ol using a suitable alkyl halide?

Q. Given below are two statements: one is labelled as Assertion $\left(A\right)$ and the other is labelled as Reason $\left(R\right)$.
Assertion $\left(A\right)$ : Synthesis of ethyl phenyl ether may be achieved by Williamson synthesis.
Reason $\left(R\right)$ : Reaction of bromobenzene with sodium ethoxide yields ethyl phenyl ether.
In the light of the above statement. choose the most appropriate answer from the options given below:

1. Both $\left(A\right)$ and $\left(R\right)$ are correct and $\left(R\right)$ is the correct explanation of $\left(A\right)$
   
2. $\left(A\right)$ is correct but $\left(R\right)$ is not correct
3. $\left(A\right)$ is not correct but $\left(R\right)$ is correct
4. Both $\left(A\right)$~ and ~$\left(R\right)$ correct but $\left(R\right)$ is NOT the correct explanation of $\left(A\right)$

Q. Why C2H5Cl gets hydrolysed easily than C6H5Cl?

Q. Which of the following compounds will have a zero dipole moment?

1. 1, 1-dichloroethylene
2. trans-1, 2-dichloroethylene
3. cis-1, 2-dichloroethylene
4. none of the above compound

Q. Which of the following has the highest rate of electophilic aromatic substitution reaction?

1. $C_6{H}_6$
2. $C_6{H}_{5}C{H}_3$
3. $C_6{H}_{5}N{O}_2$
4. $C_6{H}_{5}COOH$

Q.

Alkyl halides can be converted into Grignard reagents by

[KCET 1989]

1. Warming them with MgCL₂

2. Refluxing them with MgCL₂ solution

3. Warming them with magnesium powder in dry ether

4. Boiling them with Mg ribbon in alcoholic solution

Q. The blue colour developed during Lassaigne’s test for N is due to

1. 
2. 
3. 
4. 

Q. Which of the following represents the Dow process for the manufacture of phenol?

1. 
2. 
3. 
4. None of these

Q. Which of the follwing statments are correct?
(i) $\alpha -$ Elimination is also known as 1, 2-Elimination.
(ii) Carbene is an intermediate of E1 elimination.
(iii) In $\alpha -$ Elimination, leaving group and the proton are eliminates from same carbon.
(iv) Chloroform will undergo $\alpha -$ Elimination

1. Only (iii)
2. (i), (ii) and (iv)
3. (iii) and (iv)
4. (i) and (ii)

Q. Most acidic compound among the following is
[0.77 Mark]

1. o-cresol
2. p-nitrophenol
3. Ethanol
4. Phenol

Q. An alkyl bromide (A) forms Grignard reagent which on treatment with water, yields n-hexane. (A) On treatment with sodium forms 4, 5-diethyloctane. (A) is:

1. $C{H}_3-(C{H}_2{)}_2-\stackrel{Br}{\stackrel{|}{C}}H-C{H}_2-C{H}_3$
2. $C{H}_3-(C{H}_2{)}_2-\stackrel{Br}{\stackrel{|}{C}}H-CH=C{H}_2$
3. $C{H}_3-(C{H}_2{)}_5-Br$
4. $C{H}_3-(C{H}_2{)}_3-CHBr-C{H}_3$

Q. The major product in the following reaction is:

1. 
2. 
3. 
4. 

Q.

Grignard reagents (RMgX) are potential sources of carbanions because of

1. Polar C-Mg bond

2. Solvent properties of ether with which it is stored

3. +I effect of alkyl group

4. Their ability of react in any medium

Q.

Is Hemiacetal a reducing sugar?

Q. Find the major product?

1. 
2. 
3. 
4. 

Q.
The molar mass (g/mol) of final product C in above reaction is

Q. Distinguish between $C{H}_{3}C{H}_{2}COOH$ (propionic acid) and HCOOH (methanoic acid).

Q.

Give one example of organic chemical reaction.

Q. The reagent that gives an orange precipitate with acetaldehyde is:

1. $$N{H}_{2}OH$$
2. $$NaHS{O}_3$$
3. $$I_2$$
4. $$2,4-DNP$$

Q. Which of the following is not an organometallic compound?

1. Ethyl magnesium bromide
2. Tetraethyl lead
3. Sodium ethoxide
4. Trimethyl aluminium

Q. How alky group increases the polarity of C-X bond in alkyl halide?

Q. The correct order of reactivity of $PhMgBr$ towards
(I) Benzophenone (II) Acetaldehyde (III) Acetone
is:

1. $\left(I\right)>\left(II\right)>\left(III\right)$
2. $\left(III\right)>\left(II\right)>\left(I\right)$
3. $\left(I\right)>\left(III\right)>\left(II\right)$
4. $\left(II\right)>\left(III\right)>\left(I\right)$