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The mixed rare-earth orthochromite Nd$_{0.5}$Dy$_{0.5}$CrO$_{3}$ has a N\'eeltemperature ($T_\mathrm{{N}}$) of ${\sim}$ 175\,K, resulting in the G-typeantiferromagnetic ordering of Cr$^{3+}$ spins. The inverse susceptibility showsa deviation from Curie-Weiss law at 230\,K, with a large effective paramagneticmoment of 8.8\,${\mu}_{\mathrm{B}}$. The ZFC-FC magnetization bifurcate justabove $T_\mathrm{{N}}$ and show a distinct signature of spin reorientation near60\,K. Neutron diffraction show that below $T_\mathrm{{N}}$, the Cr$^{3+}$spins align in ${\Gamma}_{2}$ representation as ($F_{x}$, $G_{z}$). Below60\,K, due to spin reorientation, the magnetic structure is in ${\Gamma}_{1}$($G_{y}$) configuration. The neutron diffraction does not show any signature ofrare-earth ordering even at 1.5\,K. First principles density functional theorycalculations within GGA+U and GGA+U+SO approximations reveal that the G-typeantiferromagnetic order is the ground state magnetic structure of Cr sublatticeand the spin-reorientation of Cr$^{3+}$ spins can happen in the absence of3d-4f interactions unlike in the case of orthoferrites. The specific heat showsa `${\lambda}$' anomaly at $T_\mathrm{{N}}$, while at low temperature twodistinct Schottky anomalies are observed; a Schottky peak at 2\,K and anadditional step-like feature above 10\,K. Above $T_\mathrm{{N}}$, the magnetictransition is preceded by structural anomalies as seen in our x-ray diffractionand Raman measurements. The deviation of structural parameters near N\'eeltemperature is smaller. The phonon frequencies show deviation from the standardanharmonic behaviour: first near 250\,K, due to magneto-volume effects whilethe second deviation occurs near 200\,K due to spin-phonon coupling.

Complex interplay of magnetic ordering and spin-lattice coupling in orthochromite Nd$_{0.5}$Dy$_{0.5}$CrO$_{3}$