In human males all the chromosomes are paired perfectly except one. This /these unpaired chromosome is/are:

(i) Large chromosome

(ii) Small chromosome

(iii) Y chromosome

(iv) X chromosome

(iii) and (iv) Y chromosome and X chromosome

Males have all 22 pairs of chromosomes paired perfectly. The 23^rd pair of chromosome that is the pair of sex chromosomes are not paired perfectly because in the pair one chromosome is X and the other is Chromosome Y , so they are not paired perfectly.