In $1's$ complement representation, negative numbers are represented by inverting their bits (no taking of complement for positive numbers as in $2's$ complement representation). Since the leading bit is $1,$ the number is negative here. So, we invert every bit and get the value as $0011\;1101\;1010 = 2^{9}+2^8+2^7+2^6+2^4+2^3+2^1 =2^{10} - 2^{6}+26 = 1024 - 64 + 26 =986.$
So, the represented decimal value is $-986.$
Hexadecimal value in 16 bits $=\underbrace{1111}_F\; \underbrace{1100}_{C}\;\underbrace{0010}_{2}\;\underbrace{0101}_{5} = (FC25)_{16}$