List of top Chemistry Questions on Chirality & symmetry of organic molecules with or without chiral centres asked in IIT JAM BT

In the given molecule,
In the given molecule, the number of chiral centers is _
the number of chiral centers is _______.

Which one of the following compounds is the simplest alkane that is optically active? 


 

The achiral molecules among the following (I, II, III and IV) are