1

### JEE Main 2018 (Online) 15th April Evening Slot

Biochemical Oxygen Demand (BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct ?
A
Aerobic bacteria decrease the BOD value.
B
Anaerobic bacteria increase the BOD value.
C
Clean water has BOD value higher than 10 ppm.
D
Polluted water has BOD value higher than 10 ppm.

## Explanation

Aerobic bacteria decreases the BOD value and aerobic bacteria increase the BOD value. Clear water has BOD value less than 5 ppm. Polluted water has BOD value higher than 10 ppm.
2

### JEE Main 2018 (Online) 15th April Evening Slot

When 2-butyne is treate with H2/Lindlar's catalyst, compound X is produced as the major product and when treated with Na/liq. NH3 it produces Y as the major product Which of the following statements is correct ?
A
X will have higher dipole moment and higher boiling point than Y.
B
Y will have higher dipole moment and higher boiling point than X.
C
X will have lower dipole moment and lower boiling point than Y.
D
Y will have higher dipole momet and lower boiling point than X.

## Explanation

Here dipole moment of Y = 0

cis-isomer(X) will have higher dipole moment and higher boiling point than trans (Y).
3

### JEE Main 2018 (Online) 16th April Morning Slot

The major produced of the following reaction is :

A
B
C
D

## Explanation

4

### JEE Main 2019 (Online) 9th January Evening Slot

Which of the following compounds is not aromatic ?
A
B
C
D

## Explanation

Do not have (4n + 2) $\pi$ electron It has 4n$\pi$ electrons
So it is Anti aromatic.