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Topic: প্রয়োগ-অপপ্রয়োগ, Subject: Bangla Bengali literature (বাংলা সাহিত্য)

Best Answer Explained in Below-:

The question asks which of the given words contains an incorrect application of the Bengali letter 'ণ' (pronounced as 'n').

Let's examine each option:

A) **ক্রন্দণ (krandan)**: This word means "to cry" or "to weep." However, the correct spelling of this word does not include the letter 'ণ'. Instead, it should be written as 'ক্রন্দ' (krand), meaning the act of weeping does not require the 'ণ' sound.

B) **চাণক্য (chanakya)**: This refers to the ancient Indian philosopher and strategist Chanakya. Here, 'ণ' is correctly placed as it reflects the Hindi and Sanskrit origins of the name.

C) **মাণিক্য (manikya)**: This word means "gem" or "precious stone." The application of 'ণ' is correct here as it accurately represents the pronunciation and etymology of the term.

D) **গণ (gon)**: This means "group" or "crowd." The use of 'ণ' is appropriate because it correctly represents the sound required in this context.

Thus, the key takeaway is that in 'ক্রন্দণ', the inclusion of 'ণ' is inappropriate, as the word should solely rely on 'ক্রন্দ' to accurately convey the meaning without the additional nasal sound that 'ণ' introduces. Therefore, the correct choice is A) ক্রন্দণ.