Choose the sentence which is grammatically incorrect:

The correct answer is Option (1) → The colour of the new curtains in the hall do not match the walls.

The verb agrees with the main noun, not the noun in the “of” phrase:

• The given sentence says “The colour of the new curtains ... do not match”.
• The subject is “the colour”. “Of the new curtains” only describes it. “Colour” is singular, so the verb must be “does”.
• Corrected: The colour of the new curtains in the hall does not match the walls.

Why the Other Options are Incorrect?

Option 2: Measles is spreading fast in the villages near the river. This sentence is correct. “Measles” ends in -s, but it is the name of one disease. It takes a singular verb.

Option 3: A pair of binoculars was lying on the bench near the lake. This sentence is correct. The subject is “a pair”, which is singular. So “was” is right.

Option 4: The Maldives is only a short flight from Kochi. This sentence is correct. “The Maldives” is the name of one country. A country name that looks plural takes a singular verb.