1.

Which one of the following alkylbromides undergoes most rapid solvolysis in methanol solution to give corresponding methyl ether?

2.

What is the shape and magnetic nature of permanganate ion ?

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

3.

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

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

4.

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

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.

A hammer of mass $200\, kg$ strikes a steel block of mass $200\, g$ with a velocity $8\, ms^{-1}$. If $23\%$ of the energy is utilized to heat the steel block, the rise in temperature of the block is (specific heat capacity of steel = $460 \; J \; kg^{-1} \; K^{-1}$)

• 8 K
• 16 K
• 12 K
• 24 K