Introduction to Chemical Reactions

Q. The major product of the reaction is:

1. 
2. 
3. 
4. 

Q.

Which best describes the product of the following reaction?

1. Absolute configuration has been inverted

2. Absolute configuration has been retained

3. Loss of chirality has occured (the product is achiral)

4. Recemization (loss of absolute configuration) has occurred

Q. $S_{N}1$ reactions involving
chiral electrophiles usually proceed with:

1. Equal amounts of inversion and retention of configuration
2. Retention of configuration
3. Slightly more retention then inversion
4. Slightly higher proportion of inversion than retention

Q. Aniline reacts with mixed acid(conc.$HN{O}_3$ and conc.$H_{2}S{O}_4$ at 288K to give P (51%), Q (47%) and R(2%) . The major product(s) of the following reaction sequence is (are)

1. 
2. 
3. 
4. 

Q.

Amino group is ortho, para directing for aromatic electrophilic substitution. On nitration of aniline with concentrated acids, a good amount of meta nitro aniline is obtained. This is due to

1. - NH₂ becomes - NH ^-NO₂⁺, which is meta directing
2. - NH₂ becomes - NH ⁺SO₄^-2, which is meta directing
3. - NH₂ becomes - NH₃ ⁺, which is meta directing
4. In nitration mixture, ortho and para activity of NH₃ group is completely lost

Q.
The intermediate formed in the above reaction is:

1. 
2. 
3. 
4. 

Q. Acetaldehyde and excess ethyl alchohol reacts in presence of dry HCl gas. The product obtained is :

1. $$C{H}_3-CH\left(OH\right)-C_2{H}_5$$
2. $$C{H}_3-CH\left(OH\right)-C{H}_3$$
3. $$C{H}_{3}C{H}_{2}C{H}_{2}OH$$
4. $$C{H}_{3}CH(O{C}_2{H}_5{)}_2$$

Q. Aniline reacts with mixed acid(conc.$HN{O}_3$ and conc.$H_{2}S{O}_4$ at 288K to give P (51%), Q (47%) and R(2%) . The major product(s) of the following reaction sequence is (are)

1. 
2. 
3. 
4. 

Q.
The number of π-electrons in the product is: