1.

Which will undergo fastest $82$ substitution reaction when treated with $NaOH$?

• $H_5C_2 - \underset{\overset{|}{H}}{\overset{\underset{|}{C}H_3}{C}} - Br$
• $CH_3 - \underset{\overset{|}{C}H_3}{\overset{\underset{|}{C}H_3}{C}} - Br$
• $H - \underset{\overset{|}{C_2}H_5}{\overset{\underset{|}{C}H_3}{C}} - Br$
• $H - \underset{\overset{|}{Br}}{\overset{\underset{|}{H}}{C}} - CH_2 - CH_2 - CH_3$

2.

Most stable carbocation is

3.

In the given structure of a compound, the correct various bond moments direction involving are shown as

• $ Br\underline{\leftarrow }N\underline{\leftarrow }CH_{2}\underline{\to }SiH_{2}\underline{\leftarrow }CH_{2}\underline{\to }O\underline{\leftarrow }CH_{3} $
• $ Br\underline{\leftarrow }N\underline{\leftarrow }CH_{2}\underline{\leftarrow }SiH_{2}\underline{\leftarrow }CH_{2}\underline{\to }O\underline{\leftarrow }CH_{3} $
• $ Br\underline{\leftarrow }N\underline{\to }CH_{2}\underline{\leftarrow }SiH_{2}\to CH_{2}\underline{\to }O\underline{\leftarrow }CH_{3} $
• $ Br\underline{\leftarrow }N\underline{\to }CH_{2}\underline{\to }SiH_{2}\underline{\leftarrow }CH_{2}\underline{\to }O\underline{\to }CH_{3} $

4.

What is the shape and magnetic nature of permanganate ion ?

• Pyramidal diamagnetic
• Tetrahedral, diamagnetic
• Tetrahedral, paramagnetic
• Planar, paramagnetic

5.

Which of the following statements is wrong?

• Pollen grains remain viable for several months because their outer covering is made of sporopollenin
• No enzyme can degrade sporopollenin
• Pollen grains are well represented in fossil strata due to sporopollenin
• Pollen wall has cavities containing proteins

6.

During the phenomenon of resonance

• the amplitude of oscillation becomes large
• the frequency of oscillation becomes large
• the time period of oscillation becomes large
• All of the above