Aldehyde and Ketone

Identify an aldehyde used in margarine and food for its buttery odour.

Which of the following on reaction with Grignards reagent followed by hydrolysis forms secondary alcohol?

Identify the product formed in the following reaction.\(\mathrm{CH}_3-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_2-\mathrm{CHO} \xrightarrow[\text { ii) } \mathrm{H}_3 \mathrm{O}^{+}]{\text {i) } \mathrm{LiAlH}_4} \text { Product }\)

Identify the product formed in the following reaction.
\(\mathrm{CH}_3-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_2-\mathrm{CHO} \xrightarrow[\text { ii) } \mathrm{H}_3 \mathrm{O}^{+}]{\text {i) } \mathrm{LiAlH}_4} \text { product }\)

Identify functional group from following that forms pink colour when schiffs reagent is added in it.