Explain why the catalytic hydrogenation for compound A occur

Explain why the catalytic hydrogenation for compound A occurs at a much faster rate than for compound B.Explain why the catalytic hydrogenation for compound A occurs at a much faster rate than for compound B.

Solution

because in A the compound will be in steric hindrance with H2 so less reactivity than B ...steric hindrance is due to CH3grp in A