Question 1 :
Which of the following phrases are not correctly associated with $S_{N^{1}}$ reaction ?<br>(1) Rearrangement is possible<br>(2) Rate is affected by polarity of solvent<br>(3) The strength of the nucleophile is important in determining rate<br>(4) The reactivity series is tertiary &gt; secondary &gt; primary<br>(5) Proceeds with complete inversion of configuration

Question 2 :
Compounds which contain oxides of carbon or carbonate hydrogencarbonate ions are called:

Question 6 :
Linear combination of two hybridised orbitals&#160;belonging to two atoms and each having one&#160;electron leads to the formation of:

Question 9 :
The hybrid orbital having equal amounts of s&#160;and p - characters is:

Question 18 :
The first organic compound synthesised in the laboratory from its elements.

Question 19 :
Two hybrid orbitals having a bond angle of $120^0$C. The percentage of $s-$character in the hybrid orbital is nearly:

Question 21 :
Which one of the following has $sp^3, sp^2, sp$ hybrid orbitals in the ratio 6 : 3 : 2?