A series of colour words is given with one term missing. The sequence follows the standard order of the visible spectrum (rainbow). Select the correct alternative from the given options that will complete the series: Red, Orange, Yellow, ?

Introduction / Context:
This question presents a series of colour names: Red, Orange, Yellow and a missing term. The pattern is based on the familiar sequence of colours in the visible spectrum, commonly remembered as the colours of the rainbow. Your task is to recognise this sequence and select the next colour in order from the options provided. This tests general science awareness and the ability to recognise ordered lists related to everyday phenomena.

Given Data / Assumptions:

• Given series: Red, Orange, Yellow, ?
• Options: Green, Violet, Indigo, Blue.
• The series appears to represent the order of colours in a rainbow or the visible spectrum.
• The missing term should be the colour that comes immediately after Yellow in that standard order.

Concept / Approach:
The colours of the rainbow are often remembered using the acronym VIBGYOR, which stands for Violet, Indigo, Blue, Green, Yellow, Orange and Red, usually listed from the top of the arc to the bottom. However, the sequence can also be described in the reverse direction: Red, Orange, Yellow, Green, Blue, Indigo, Violet. The given list starts at the red end and moves through Orange to Yellow. Therefore, we must find the next colour in this specific ordering, which is Green.

Step-by-Step Solution:
Step 1: Recall the standard rainbow colour sequence when moving from red towards violet: Red, Orange, Yellow, Green, Blue, Indigo, Violet. Step 2: Compare this with the given series: Red, Orange, Yellow, ? Step 3: In the standard sequence, the colour that comes immediately after Yellow is Green. Step 4: Check the options to see whether Green is present. It is given as option Green. Step 5: Therefore, Green is the correct term to complete the series Red, Orange, Yellow, Green.

Verification / Alternative check:
To verify, extend the complete series starting from Red: Red, Orange, Yellow, Green, Blue, Indigo, Violet. Among the options, Violet appears last in the full sequence and therefore does not fit as the immediate next colour after Yellow. Indigo and Blue also appear later in the spectrum than Green. Only Green occupies the correct position just after Yellow when moving from the red end of the rainbow towards the violet end, confirming that it is the only option consistent with the established order.

Why Other Options Are Wrong:
Blue is a valid rainbow colour but comes after Green in the sequence, not directly after Yellow. Indigo and Violet also appear after Blue and are further away from Yellow in the spectrum, so they cannot be the immediate successor. Since the question asks for the colour that directly follows Yellow in the standard rainbow ordering, none of these alternatives can be correct.

Common Pitfalls:
Some candidates may remember the acronym VIBGYOR but confuse the direction of the sequence or forget the exact intermediate order of colours. Others may be tempted by Blue because it is a familiar and common colour. To avoid errors, it is useful to write out or mentally rehearse the entire sequence Red, Orange, Yellow, Green, Blue, Indigo, Violet and then pick the colour that occupies the correct position relative to the given starting point.

Final Answer:
In the standard rainbow sequence, the colour that comes immediately after Yellow is Green, so Green is the correct answer to complete the series Red, Orange, Yellow, Green.