Among isomeric alkanes of molecular formula `C_5H_12`, identity the one that on photochemical chlorination yields 3 isomeric monochlorides

Explanation

figure
All the hydrogen atoms of 4 methyl groups are
equivalent and replacement of any hydrogen will give the same product.
C^4 H_3 E^ b H_2 C^ C H_2 C^ b H_2 C^2 H_3
The equivalent hydrogens are grouped as a.b.c and d. The replacement of equivalent hydrogens will give the same product.
iii. FIGURE
Simitarly the equivalent hydrogens are grouped as a, b, c and d.Thus four isomeric products are possible