Sure, let's analyze the pronunciation of the underlined parts in each word to determine which one is pronounced differently from the others.

1.
- A. ch**a**pter (pronounced /ˈtʃæptər/)
- B. y**a**cht (pronounced /jɒt/)
- C. m**a**nage (pronounced /ˈmænɪdʒ/)
- D. p**a**nel (pronounced /ˈpænəl/)

The underlined part in "yacht" is pronounced differently from the others. The correct answer is **B**.

2.
- A. **e**xample (pronounced /ɪɡˈzæmpəl/)
- B. f**ee**d (pronounced /fiːd/)
- C. **i**nk (pronounced /ɪŋk/)
- D. **i**nhumane (pronounced /ˌɪnhjuˈmeɪn/)

The underlined part in "feed" is pronounced differently from the others. The correct answer is **B**.

3.
- A. j**u**nior (pronounced /ˈdʒuːniər/)
- B. h**u**mour (pronounced /ˈhjuːmər/)
- C. st**ew** (pronounced /stjuː/)
- D. p**u**rify (pronounced /ˈpjʊrɪfaɪ/)

The underlined part in "stew" is pronounced differently from the others. The correct answer is **C**.

4.
- A. h**a**ll (pronounced /hɔːl/)
- B. dr**o**ll (pronounced /droʊl/)
- C. ch**a**lk (pronounced /tʃɔːk/)
- D. f**o**recast (pronounced /ˈfɔːrkæst/)

The underlined part in "droll" is pronounced differently from the others. The correct answer is **B**.

5.
- A. r**e**cite (pronounced /rɪˈsaɪt/)
- B. r**e**concile (pronounced /ˈrekənsaɪl/)
- C. r**e**fund (pronounced /ˈriːfʌnd/ or /rɪˈfʌnd/)
- D. r**e**produce (pronounced /ˌriːprəˈdjuːs/)

The underlined part in "reconcile" is pronounced differently from the others. The correct answer is **B**.