Chloroxylenol contains a phenolic –OH group → Ferric chloride test (R). Norethindrone has a primary amine group → Carbylamine test (P). Sulphapyridine contains a C=C double bond (unsaturation) → Bayer's test (S). Penicillin is a carboxylic acid → Sodium hydrogencarbonate test (Q). So: $A \to R,\ B \to P,\ C \to S,\ D \to Q$.

Organizational restructuring involves major changes like flattening organizations (reducing management levels), mergers and acquisitions (combining independent organizations), and joint ventures/alliances. Routine employee promotions are normal HR operations, not restructuring initiatives.

Distance in $n$-th second from rest: $s_n = \dfrac{a}{2}(2n-1)$

For $n = 3$, $a = \dfrac{4}{3}\text{ m/s}^2$:

$s_3 = \dfrac{4/3}{2}(2\times3-1) = \dfrac{2}{3}\times 5 = \mathbf{\dfrac{10}{3}\text{ m}}$

Wilms' Tumor (Nephroblastoma) — most common renal malignancy in children (peak age 3–4 years).

Classic presentation:

• Asymptomatic abdominal mass (discovered by parent/during bath)
• Painless gross hematuria
• Hypertension (renin secretion)
• Child appears well (unlike neuroblastoma — ill-appearing)

Important physical examination note: DO NOT palpate the abdominal mass repeatedly — risk of tumor capsule rupture and metastatic seeding.

Associations:

• WAGR syndrome: Wilms' + Aniridia + Genitourinary anomalies + mental Retardation (WT1 gene mutation)
• Beckwith-Wiedemann syndrome
• Hemihypertrophy

Staging and Treatment:

Treatment: Nephrectomy + chemotherapy (actinomycin D, vincristine) ± radiotherapy. Wilms' has excellent prognosis — one of most curable solid tumors.