Ozonolysis of Aromatics

Q. Which of the following compound(s) will give $C{O}_2$ on reaction with $NaHC{O}_3$?

1. 
2. 
3. 
4. 

Q. A list of activating and deactivating groups on benzene ring

Q. H2SO4 is not used during reaction of alcohols with KI because H2SO4 oxidizes HI to I2. But why this does not happen when H2SO4 react with KBr? Also why H3PO4 not used with KBr?

Q. Can oxidation of alkene to formaldehyde be done using k2cr2o7

Q. (I) m-nitrobromobenzene (II) 2, 4, 6-trinitrobromobenzene
(III) p-nitrobromobenzene (IV) 2, 4-dinitrobromobenzene
The decreasing order of reactivity for given compounds towards $O{H}^{-}$ ions is:

1. I > II > III > IV
2. II > IV > III > I
3. IV > II > III > I
4. II > IV > I > III

Q.

Towards an electrophilic reagent :

1. Ethane is more reactive than ethyne

2. Reactivity cannot be predicted

3. Ethane is less reactive than ethyne

4. Both have equal reactivity

Q. why tertiary alcohols cannot be obtained by reduction of carbonyl compounds

Q. Benzene does not undergo addition reactions easily because:

1. It has a cyclic structure.
2. It has $6H$-atoms.
3. Double bonds in it are very strong.
4. Resonance stabilized system is to be preserved.

Q. The structure of intermediate A in the following reaction is:

1. 
2. 
3. 
4. 

Q. The intermediate formed during the reaction of $R-\stackrel{O}{\stackrel{||}{C}}-N{H}_2$ with $B{r}_2$ and $KOH$ are:

1. $RNHCOBr$ and $RNCO$
2. $RNHBr$ and $RCONHBr$
3. $RCONHBr$ and $RNCO$
4. $RCONB{r}_2$

Q. Complete the following reaction

Q. Which of the following has greatest reducing power

1. HI

2. HBr

3. HCl

4. HF

Q. The no. Of different substitution products when bromine and Ethane are allowed to react?

Q. Benzene $+H_2\stackrel{Ni/{200}^{0}C}{⟶}X,X$ is :

1. Cyclohexane
2. Cyclohexene
3. n-hexane
4. Cyclopentane

Q. The product of the above reaction is:

Q. The addition of $1$ equivalent of $DCl$ to $1,3-$ cyclohexadiene generates a mixture of products. Find out the total no. of products.

Q. why 2^o alcohol are converted to ketone by
Cu and CrO₃ ?

Q. Which reagents would you use to carry out the reaction
Ethyl benzene $\to$ 2 and 4- chloro 1. ethyl benzene ?

1. $C{l}_2$, light and heat
2. $SOC{l}_2$
3. $C_2{H}_{5}Cl,AlC{l}_3$
4. $C{l}_2$, Feels

Q. When benzene undergoes hydrogenation in the presence of a catalyst, the energy that is released (the heat of hydrogenation) is:

1. same as for cyclohexatriene
2. less than for cyclohexatriene
3. same as for 1, 3- cyclohexadiene
4. same as for 1, 4- cyclohexadiene

Q.

which effect does benzene ring show- +R or -R effect?

Q. Which compound is treated with KCN to get butane nitrile?

Q. Does HNO3 as an oxidising agent oxidise aldehyde and primary alcohols only ? Specifically primary alcohols??

Q. Although benzene is highly unsaturated, it does not undergo addition reactions.

Q. The given reaction does not occur because on addition the ring lost its
aromaticity and on deprotonation of $\sigma$-complex it
retains the aromaticity hence ________reaction takes place.

1. elemination
2. addition
3. substitution
4. none

Q. Benzene is less reactive than ethene and ethyne towards addition reaction due to

1. the presence of $3\pi$ - bonds
2. cyclic nature
3. $s{p}^2$-hybridization of carbon atoms
4. delocalization of $\pi$ electrons.

Q. The compound
$C_7{H}_8\stackrel{3C{l}_2/\Delta }{\to }A\stackrel{B{r}_2/Fe}{\to }B\stackrel{Zn/HCl}{\to }C$.
The compound C is:

1. o-bromotoluene
2. p-bromotoluene
3. m-bromotoluene
4. 3-bromo-2, 2, 6-trichlorotoluene

Q. Toluene is nitrated and the resulting product is reduced with tin and hydrochloric acid. The product so obtained is diazotised and then heated with cuprous bromide. The reaction mixture so formed contains:

1. mixture of o and p-bromotoluenes
2. mixture of o and p-dibromobenzenes
3. mixture of o and p-bromoanilines
4. mixture ofoandm-bromotoluenes

Q. Gammexane is obtained from benzene when it reacts with

1. $B{r}_2$ in bright sunlight (in the absence of a catalyst)
2. $C{H}_{3}Cl$ in the presence of anhydrous $AlC{l}_3$
3. $C{l}_2$ in bright sunlight (in the absence of a catalyst)
4. $COC{l}_2$ in the presence of anhydrous $AlC{l}_3$

Q. Why does a presence of a nitro group make the benzene ring less reactive in comparison to the unsubstituted benzene ring. Explain.