SN1 Reaction Mechanism

Q. In an $S_{N}1$ reaction on chiral centres, there is:

1. 100% retention
2. 100% racemization
3. inversion more than retention leading to partial recemization
4. 100% inversion

Q.

Reactivity of alkyl halides towards ${\mathrm{SN}}_1$ nucleophilic substitution reaction.

Q. An organic compound $\left(C_3{H}_{9}N\right)\left(A\right)$ when treated with nitrous acid, gave an alcohol and $N_2$ gas was evolved. $\left(A\right)$ on warming with $CHC{l}_3$ and caustic potash gave $\left(C\right)$, which on reduction gave isopropylmethylamine. Predict the structure of $\left(A\right)$.

1. 
2. 
3. 
4. 

Q. For a reaction A+B-products, the rate of reaction was double when the concentration of A was double, the rate was again double when the conc. of A and B were doubled the order of the reaction with respect A and B are?

Q.

How Are ${\mathrm{XeF}}_2$And ${\mathrm{XeF}}_4$ Prepared?

Q. Methyl bromide reacts with silver acetate to give

1. Acetic acid
2. Acetyl chloride
3. Methyl acetate
4. Acetaldehyde

Q. 26 Why imidazole is more basic then pyridine ?

Q.

What are the species that are formed when ${\mathrm{BCl}}_3$ is hydrolyzed?

Q.

What are metal carbonyles?

Q.

What is electrophilic substitution of benzene?

Q.

Why is Ethanoic acid considered as weak acid?

Q. What is the major product 'P' of the given reaction?

1. 
2. 
3. 
4. 

Q.

How is ethyne converted to

(iii) tetrabromoethane

Q. Consider the following orders –
(1) $F_2>C{l}_2>B{r}_2>I_2:$ boiling point
(2) $F_2>C{l}_2>B{r}_2>I_2:$ oxidizing nature
(3) $F_2>C{l}_2>B{r}_2>I_2:$ EN
(4) $F_2>C{l}_2>B{r}_2>I_2:$ BDE
(5) $F_2>C{l}_2>B{r}_2>I_2:$ EA
(6) $F_2>C{l}_2>B{r}_2>I_2:$ Reactivity
(7) $HOCl>HCl{O}_2>HCl{O}_3>HCl{O}_4:$ Acidic nature
(8) $HOCl>HCl{O}_2>HCl{O}_3>HCl{O}_4:$ Oxidizing nature
Then calculate $(x^2+y^2)$ when $x$ is correct order and $y$ is incorrect order.

Q. Which of the following two reactions is $S_{N}2$ and why?

Q. Which of the following amines will not give the carbylamine test?

1. $C{H}_{3}N{H}_2$
2. 
3. 
4. 

Q. Compound $A$ is converted to $B$ on reaction with $CHC{l}_3$ and $KOH$. The compound $B$ is toxic and can be decomposed by $C$.
$A,B$ and $C$ respectively are

1. Secondary amine, nitrile compound, conc. $NaOH$
2. Primary amine, isonitrile compound, conc. $HCl$
3. Secondary amine, isonitrile compound, conc $NaOH$.
4. Primary amine, nitrile compound, conc. $HCl$

Q. Neopentyl chloride reacts with benzene in presence of a Lewis acid $\left(AlC{l}_3\right)$ to form

1. 
2. 
3. 
4. 

Q. A metal salt solution when treated with dimethyl glyoxime and
$N{H}_{4}OH$ gives a rose red complex. The metal is:

1. $Ni$
2. $Mn$
3. $Co$
4. $Zn$

Q. what happen when (+)2- iodobutane is treated with NaI in dry acetone??SINCE THIS REACTION FOLLOW SN2 MECHANISM THEN WHY RACEMIC MIXTURE IS FORMED (WHICH IS PROPERT OF SN1)

Q.

What type of acid is ethanoic acid?

Q. For complete racemization:

1. Compound should not have any optical isomers.
2. Optical isomers are present in 2:3 ratio.
3. Two equal and opposite optical isomers are present.
4. None of the above

Q. Which of the following is not the chain stopping unit in the preparation of silicones?

1. $(C{H}_3{)}_{2}SiC{l}_2$
2. $\left(C{H}_3\right)SiC{l}_3$
3. $${\left(C{H}_3\right)}_{3}SiOSi{\left(C{H}_3\right)}_3$$
4. $(C{H}_3{)}_{3}SiCl$

Q. Read the assertion and reason carefully to mark the correct option out of the options given below:
Assertion:Benzene diazonium chloride does not give tests for nitrogen

Reason: $N_2$ gas lose takes place during heating.

1. If both assertion and reason are true and the reason is the correct explanation of the assertion.
2. If both assertion and reason are true but reason is not the correct explanation of the assertion.
3. If assertion is true but reason is false.
4. If the assertion and reason both are false.

Q.

The purest form of iron is

1. Pig iron

2. Cast iron

3. Wrought iron

4. None of these

Q. A person was using water supplied by Municipality. Due to shortage of water he started using underground water. He felt laxative effect. What could be the cause?

Q. The reagent, with which both acetaldehyde and acetone react easily is:

1. Tollens reagent
2. Schiffs reagent
3. Fehling's solution
4. Grignard reagent

Q.

Is Peptide Bond strong or weak?

Q. Which of the following is an incorrect statement about benzenediazonium chloride ?

1. It is prepared by the reaction of aniline with nitrous acid at 273-278 K
2. It is a colourless crystalline solid
3. Alkyl diazonium salts are more stable than arenediazonium salts
4. Benzene diazonium fluoroborate is water insoluble & stable at room temperature

Q.

The reaction R-Br + NaCN R-CN + NaBr is an example of:

1. Elimination reaction

2. Electrophillic substitution

3. Oxidation-reduction

4. Nucleophilic substitution