Which of the following will give $-ve$ Tollen's but $+ve$ Iodoform test?

Which of the following compounds gives only a primary alcohol on reaction with a Grignard reagent $(RMgX)$?

In the given reaction,the number of chiral carbon$(s)$ in product $A$ is .......
(Where $Et$ is $-C_2H_5$)

Which of the following can be distinguished by the iodoform reaction?

Write about the Wolff-Kishner reduction reaction. Or,write the reduction reaction of aldehydes and ketones by the Wolff-Kishner reduction reaction.

The major product of the following reaction is