Dynamic 2d array in C++

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C++11

I wanted to create a dynamic 2d array , but ended up with the following error :

[Error] C:\Users\User\Documents\C-Free\Temp\Untitled2.cpp:8: E2034 Cannot convert 'int ( *)[100]' to 'int *' in function main()

This was compiled using Borland C++ 5.5.

Below is the troublesome code :

int * h = NULL;
    h = new int[100][100];
    if(h==NULL)
    {

        cout<<"\nERROR : No more space available.";
        exit(1);

    }

What could be wrong with this? What is the correct syntax if wrong?
Also suggest a way how to deallocate the memory used by it.