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1.

Write two differences between SN1 and SN2 reaction. 

Answer»

(i) SN1 is given by tert. alkyl halide while SN2 is given by pri. alkyl halide. 

(ii) SN1 is due to presence of steric hindrance and SN2 is due to lack of steric hindrance.  
Discussion
2.

Write the name of 2 name reactions in which chloroform is used. 

Answer»

 Carbylaminereaction, Reimer Tiemann reaction. 
Discussion
3.

What is Saytzaffrule? Give example

Answer»

During dehydrohalogination of alkyl halide, formation of such alkene is preferred which has more number of alkyl group with doubly bonded carbon atom.(More symmetrical alkene)

CH3 -CH (Br)- CH2 - CH3 + alc. KOH→ CH3 -CH = CH- CH3 +KBr + H2O Butene-2(major product)
Discussion
4.

Write the name of two polyhalogens compounds with their uses.  

Answer»

Chloroform-anesthatic 

Iodoform-antiseptic 
Discussion
5.

 Write the equation for the name reaction in which- (i) Iodoalkane is prepared  (ii) Fluoroalkane is prepared 

Answer»

(i) Finkelstein reaction- 

C2H5Cl + NaI (with acetone) → C2H5I +NaCl 

(ii) Swarts reaction – 

CH3I +AgF→ CH3 F + AgCl 
Discussion
6.

 Define the following (i) Racemic mixture (ii) Chirality 

Answer»

(i) A mixture containing two enantiomers in equal proportions will have zero optical rotation, are called as racemic mixture (or) racemic modification 

(ii) The property of a molecule of being non-superimposible on its mirror image is known as Chirality.
Discussion
7.

Why does NO2 group show its effect only at ortho- and para- positions and not at meta- position during nucleophilic substitution reaction? 

Answer»

The presence of nitro group at ortho- and para-positions withdraws the electron density from the benzene ring and thus facilitates the attack of the nucleophile on haloarene. The carbanion thus formed is stabilised through resonance. The negative charge appears at ortho- and para- positions with respect to the halogen substituent is stabilised by –NO2 group while in case of metanitrobenzene, none of the resonating structures bear the negative charge on carbon atom bearing the –NO2 group. Therefore, the presence of nitro group at metaposition does not stabilise the negative charge and no effect on reactivity is observed by the presence of –NO2 group at meta-position. 
Discussion